The Schoolmen had no historical sense and little historical information; hence they fell into one error after another on the essentials in the rite of ordination.
Microscopically their structure is the same in essentials as that of the coxal glands of Scorpio (13).
The positive side of his teaching resembles in all essentials that of Arcesilaus (q.v.).
The religion of Palmyra did not differ in essentials from that of the north Syrians and the Arab tribes of the eastern desert.
But the belief died hard; the synthesis of urea remained isolated for many years; and many explanations were attempted by the vitalists (as, for instance, that urea was halfway between the inorganic and organic kingdoms, or that the carbon, from which it was obtained, retained the essentials of this hypothetical vital force), but only to succumb at a later date to the indubitable fact that the same laws of chemical combination prevail in both the animate and inanimate kingdoms, and that the artificial or laboratory synthesis of any substance, either inorganic or organic, is but a question of time, once its constitution is determined.'.