Upon the purely Deistic notions of antiquity, however, Harvey unquestionably ingrafted the special faith in Christianity. In connexion with the subject of the “term utero-gestation,” he adduces the highest recorded examples as the rule, and speaks of “Christ, our Saviour, of men the most perfect;”[69] in the will he farther “most humbly renders his soul to Him that gave it, and to his blessed Lord and Saviour Christ Jesus.” Harvey was very inquisitive into natural things and natural phenomena. When he accompanied the Earl of Arundel, we have seen that he would still be wandering in the woods, making observations on the strange trees and herbs, and minerals he encountered. His industry in collecting facts was unwearied, and the accuracy with which he himself observed appears in every page of his writings; though we sometimes meet him amiably credulous in regard to the observations of others,--as in that instance where he suffers himself to be imposed upon by the traveller’s tale of the “Genus humanum caudatum”--the race of the human kind with tails.[70] Harvey was the first English comparative anatomist; in other words, he was the first physiologist England produced whom superiority of natural endowment led to perceive the relations between the meanest and the highest of created things, and who made the simplicity of structure and of function in the one, a means of explaining the complexity of structure and of function in the other. “Had anatomists,” he says, “only been as conversant with the dissection of the lower animals as they are with that of the human body, many matters that have hitherto kept them in a perplexity of doubt would, in my opinion, have met them freed from every kind of difficulty.” (On the Heart, p. 35.) Harvey makes frequent and most effectual use of his knowledge of comparative anatomy in his earlier work; and if the reader will turn to the one on Generation (p. 423), and peruse what is said on the subject of ‘parts not essential to the being of the individual,’ and will then visit the Hunterian Museum in Lincoln’s Inn Fields, he will find that the great comparative anatomist and physiologist of the 19th century had a herald in the great comparative anatomist and physiologist of the 17th century. Aubrey mentions particularly Harvey’s having “often said that of all the losses he sustained, no grief was so crucifying to him as the loss of his papers (containing notes of his dissections of the frog, toad, and other animals,) which, together with his goods in his lodgings at Whitehall, were plundered at the beginning of the rebellion.” Harvey’s store of individual knowledge must have been great; and he seems never to have flagged in his anxiety to learn more. He made himself master of Oughtred’s ‘Clavis Mathematica’ in his old age, according to Aubrey, who found him “perusing it, and working problems not long before he dyed.”