Several things interest me about Oahspe.
First, it contains a tale of human racial history and dispersal from a "lost continent" in the Pacific. I'm interested in how the ideas in Oahspe articulate with political and scientific thinking in late 1800's America.
Second, it's one of several nineteenth century American religious developments based on received revelations. Unlike the Book of Mormon (1830) and the prophecies of Seventh-Day Adventist (SDA) Ellen G. White (experienced from 1844-1863), however, the writings in Oahspe did not develop a large following (I don't know how many Faithists there are today, but certainly many fewer than there are Mormons or Seventh-Day Adventists).
Third, I'm interested in the person and the process. Newbrough was born near where I grew up (Wikipedia says Mohicanville, Ohio, while I've seen other sources online specify Wooster, Ohio, and Springfield, Ohio) and apparently used a typewriter for his "automatic writing." And there are apparently connections between his dental practice and his spirituality.
Anyway, the first thing I did was look for giants in Oahspe. They're pretty much absent from the Book of Mormon. In SDA and Young Earth Creationist traditions, humans closer to creation were "bigger, better, and smarter" than the degenerated humans of today. What does Oahspe have to say?
1. In the beginning God created the heavens of the earth; and the Lord made man upright. And man was naked and not ashamed; neither knew man the sin of incest, but he dwelt as the beasts of the field.
2. And the Lord brought the angels of heaven to man; by his side took they on forms like unto man, having all the organs and attributes of mortals, for it was the time of the earth for such things to be.
3. And it came to pass that a new race was born on the earth, and these were called I'hins, because they were begotten of both heaven and earth. Hence it became a saying: The earth conceived of the Lord.
4. And the name of the first race was Asu (Adam), because they were of the earth only; and the name of the second race was I'hin (Abel), because they were capable of being taught spiritual things.
5. And the Lord said: Of all that live on the face of the earth, or in the waters thereof, or in the air above, that breathes the breath of life, man only have I delivered unto knowledge of his Creator.
6. And the Lord spake unto the I'hin, through his angels spake he to them, saying: Go hide thy nakedness, for it is the commandment of God.
7. And The I'hins were afraid, and they clothed themselves, and were no longer naked before the Lord.
8. And the Lord commanded the angels to give up their forms, and to be no more seen as mortals. And it was done. And the Lord said unto them: Because ye brought forth life, which is in flesh and blood, ye shall minister unto man for six generations on the face of the earth. And it was so.
9. And that man may continue to walk upright, ye shall teach him the law of incest, for man of himself cannot attain to know this.
10. Neither shall ye permit the I'hins to dwell with Asu (Adam), lest his seed go down in darkness.
11. And man was thus inspired of the Lord, and he walked upright, and prospered on the earth.
12. But after a season man became conceited in his own judgment, and he disobeyed the commandments of God.
13. And he strayed out of the garden of paradise and began to dwell with the asu'ans (Adams), and there was born into the world a new race called Druk (Cain), and they had not the light of the Father in them, neither could they be inspired with shame, nor of heavenly things.
14. And the I'hins were grateful to the Lord, and they gave sacrifice in burnt offerings. And they said unto the Druks: Go ye and sacrifice unto the Lord, and he will prosper you. But the Druks understood not; and they fell upon the Lord's chosen, and slew them, right and left, taking their possessions.
15. And the Lord said unto the Druks: Because ye have slain your brethren ye shall depart out of the place of God; and that ye may be known to the ends of the earth I put my mark upon you.
16. And the mark of the Lord put upon the Druks was the shadow of blood, which, being interpreted, is WAR.
17. And the Lord God said: By this sign shall the tribes of Druk and their descendents be known unto the end of the world.
18. And woman, being more helpless than man, cried out with fear, saying: O Lord, how shall I bring forth unto thee, and not unto the sons of death?
19. And the Lord said: Because thou hast brought forth in pain, and yet called on my name, behold I will be unto thee as a shield and protector. For I will also put a mark upon the I'hins, my chosen, so thou shalt know them when they come unto thee.
20. And the Lord commanded the male I'hins, old and young, to be circumcised, that woman might not be deceived by the druks. And the I'hins circumcised one another, old and young; for it was the testimony of the Lord unto woman that seed of their seed was born to everlasting life.
21. And the druks (Cain) went away into the wilderness, and dwelt with the asu'ans and with one another.
22. God said: A boundary line will I make betwixt the tribes of druks and the I'hins; and this is the line that I the Lord God make betwixt them:
23. The I'hins shall labor and clothe themselves, and I will abide with them; but the druks shall wander in the wilderness, neither laboring nor clothing themselves.
24. And it was so.
1. The time of the habitation of Asu was eight thousand years; and they survived two thousand years after the time of the birth of the I'hins, which is to say: Asu dwelt on the earth six thousand years, and then conceived of the chosen of God; and after that survived yet two thousand years.
2. And Asu (Adam) disappeared off the face of the earth.
3. And there remained on the earth the sacred people, the I'hins; and the carnivorous people, the druks.
4. The I'hins were white and yellow, but the druks were brown and black; the I'hins were small and slender, but the druks were tall and stout.
5. Now, because the druks had not previously obeyed the Lord, but went and dwelt with the asu'ans, there was a half-breed race born on the earth, called Yak, signifying ground people; and they burrowed in the ground like beasts of the forest. And the Yaks did not walk wholly upright, but also went on all fours.
6. God said: Because the Yaks cannot be taught the crime of incest, behold they shall not dwell forever on the earth. So also shall it be with the druks, save wherein they cohabit with the I'hins, whose seed is born unto everlasting life. But with the druks, and their heirs that spring from the Yaks, there shall be an end, both in this world and the next.
7. And the arms of the Yaks were long, and their backs were stooped and curved. And the Lord said: Because they are the fruit of incest, and not capable of speech, nor of eternal life in heaven, the I'hins shall make servants of them.
8. And that they may not tempt my chosen to bring forth fruit unto destruction, they shall be neutralized in my sight. And the angels of God taught the I'hins to make eunuchs of the Yaks; of the males and females made the I'hins eunuchs of the Yaks, and took them for servants.
9. And the Lord said: The Yaks shall serve the I'hins, and build and sow and reap for them. And it was so.
. . .
. . .
23. And again the Lord brought the I'hins together in lodges and cities, and he said unto them: Henceforth ye shall live upon the earth as an example of righteousness. And your brethren who have mingled with the tribes of darkness shall no longer molest you, but be your defenders and protectors.
24. And there began to be a new tribe on the earth; and they were called I'huans, because they were half-breeds, betwixt the druks and I'hins. The I'huans were red like copper; and they were taller and stronger than any other people in all the world. And the Lord commanded the I'huans, saying:
25. Protect ye the I'hins, the little people, white and yellow; call them THE SACRED PEOPLE. For ye are of them, and ye are also of the Lord your God. And it was so."
In the Oahspe version of prehistory, it's the crossing of spiritual and animal beings that produces "true" humans that are apparently rather small. This contrasts sharply with the Nephilim-centric view of the past wherein such matings produced corrupt, giant, evil beings.
When humans (I'hin) go against instructions and mate with the non-human hominds (Asu), they produce something called a druk (druk is equated with "giant" only once that I see in Oahspe -- The Lord's First Book, chapter 1, verse 29). Druks are not fully human. Yaks, the products of matings between druks and the animal Asu, are even worse off. Matings between the not-fully-human druks and the I'hin produce the tall, strong, red-skinned, "half-breed" I'huan, which Faithists apparently take as Native Americans.
I've stumbled across several online attempts to reconcile the racial scheme of Oahspe with the fossil record (druks as Neanderthals, I'hin as Homo floriensis, Asu as Ardipithecus ramidus, etc.). The timing of Oahspe is particularly interesting in that regard. It was written decades after publication of Darwin's On the Origin of Species (1859) but just prior to the discovery and/or recognition of human fossil remains in Indonesia and Europe in the late 1880's and 1890's. The idea of a sunken continent in the Pacific seemed plausible at the time, and was proposed as a way to account for the geographic distribution of plants and animals as well as the lack of a human fossil record.