"Contains, substantially, the lectures ... delivered, in the spring of 1863, at the Royal college of surgeons of England ..." Known primarily as the protagonist of evolution in the controversies immediately following the publication of Darwin's On the Origin of Species late in 1859, zoologist Huxley studied and wrote on a wide range of subjects, including education, philosophy, evolution and religion. "In 1863 he delivered a course of lectures at the College of Surgeons 'On the Classification of Animals,' and another 'On the Vertebrate Skull'. The scrupulous care with which he endeavored to verify by actual observation every statement made in his lectures rendered the labor of preparation very great. Sir William Flower describes the way in which he would spend long evenings at the College of Surgeons, dissecting animals available among the stores, or making rapid notes and drawings, after a day's work in Jermyn Street. The consequences were twofold; the vivid impression of his own recent experience was communicated to his hearers, and the work of preparation became at once an incentive to further research and a means of pursuing it" (DNB).