114 BIOLOGY AND ITS MAKERS 
cally arranged, for convenience of reference, and thus ani- 
mals that were closely related are often widely separated. 
Gesner (Fig. 32) sacrificed his life to professional zeal 
during the prevalence of the plague in Zurich in 1564. Hav- 
ing greatly overworked in the care of the sick, he was seized 
with the disease, and died at the age of forty-nine. 
Considered from the standpoint of descriptions and illus- 
trations, Gesner’s Historia Animalium remained for a long 
Fic. 32.—GESNER 1516-1565. 
time the best work in zodlogy. He was the best zodlogist 
between Aristotle and John Ray, the immediate predecessor 
of Linneus. 
Jonston and Aldrovandi.—At about the same period as 
Gesner’s work there appeared two other voluminous publica- 
tions, which are well known—those of Jonston, the Scot 
