George Washington Carey's "Tree of Life" is one of a number of interesting works combining biblical lore and physical science which were in vogue in spiritual circles from the end of the 19th century through roughly the era of the Great Depression. Fixating on the pineal gland, chemistry, and astrology, it even contains a sort of utopian post-end times prediction. Now generally outdated, the chemistry it contains was once both fully modern and extremely intriguing. Its author did not limit his work to this but wrote on topics as far reaching from biochemistry as the antichrist.