176 BIOLOGY AND ITS MAKERS 
des Menschen und der Thiere) published in 1857. He applied 
histology especially to the tissues of insects in 1864 and sub- 
sequent years, an account of which has already been given 
in Chapter V. 
Cajal as Histologist.—Ramon y Cajal, professor in the 
University of Madrid, is a histologist whose work in a special 
Fic. 53.—S. Ramon y Caja, 1850- 
field of research is of world-wide renown. His investigations 
into the microscopic texture of the nervous system and sense- 
organs have in large part cleared up the questions of the com- 
plicated relations between the nervous elements. In com- 
pany with other European investigators he visited the United 
States in 1899 on the invitation of Clark University, where his 
lectures were a feature of the celebration of the tenth anni- 
