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 JENNER. 255 tunities which his patron enjoyed, as a lecturer, as surgeon to St. George's Hospital, and in the pos- session of a menagerie at Brompton, where he prosecuted his inquiries into the liabits and struc- ture of animals. This was a fortunate crisis in Jenner's life ; the spark of observation was latent in his mind, and Hunter supplied the friendly- breath. Jenner became an enthusiast in pursuit of natural history, in its most extended sense. In the dissection of tender and delicate organs, and in minute injections, he was almost unrivalled, and displayed the parts with the greatest accuracy and elegance. He bequeathed to Dr. Baron, of Gloucester, his friend and able biographer, a preparation which combines all these qualities. It represents the progress of the ovum in our common domestic fowl, from its first develop- ment to its full and complete growth, when it is about to be dropped from the oviduct. The vas- cularity of the membrane which invests the ova, as well as the internal state of the oviduct, where the shell is formed, are all exhibited with masterly skill. While he was residing with Hunter, in 1771, Captain Cooke returned from his first voyage of discovery. The specimens of natural history which had been collected by Sir Joseph Banks were in a great measure arranged by Jenner, who was recommended by Hunter for that ser- vice. So much dexterity and knowledge were evinced by him in the execution of this labour, that he was offered the appointment of Natu- ralist to the next expedition, which sailed in 1772. Neither this flattering proposal, however,