No. 375.] LOUIS AGASSIZ. 157 
of many of our hydroids; here details of the histology of 
these interesting forms. It is true that we can no longer 
agree with some of his theses. We no longer accept his views 
as to the homologies of the Radiata, nor can we longer adopt 
the Radiate group; but these changes, due to our increase of 
knowledge, detract but little from the general value of the 
work. 
These volumes form the only extensive work published by 
Agassiz during his residence in America, but his shorter papers 
are both numerous and valuable.! He planned numerous other 
works, but none of these plans were carried out. The labor of 
teaching and the work demanded by a great and rapidly grow- 
ing museum so completely occupied his time that there was no 
chance to carry out these contemplated investigations. 
Three times was Agassiz recalled to Europe: in 1855 to the 
chair of zoology in the newly established University of Zurich, 
in 1857 to the head of the Jardin des Plantes in Paris, and in 
1859 again to the same position. In spite of all of the attrac- 
tions of these positions, he decided to remain in America, and 
at the beginning of our Civil War he showed his faith in the 
United States by becoming a naturalized citizen,— an Ameri- 
can by right as well as by residence. 
During the latter years of his life his originally strong con- 
stitution began to show the effects of early exposure and of 
overwork. Several times he had to give up entirely and to rest, 
but any long rest was impossible for him. In 1873 came the 
chance to establish a summer school for teachers, and the 
labors connected with the short-lived but ever-memorable 
school at Penikese told severely upon him. Still he kept at 
work, and even as late as the 2d of December he delivered a 
lecture before a farmers’ institute at Fitchburg, his last public 
appearance. December 6 he was taken with paralysis of the 
larynx, and on Dec. 14, 1873, death came. Agassiz is buried 
at Mt. Auburn, and his monument is an Alpine boulder from 
the Glacier of the Aar, while around it grow pines transplanted 
from the hill behind Neuchatel. 
1A practically complete bibliography is given in Marcou’s Life of Agassiz. It 
enumerates 425 titles. 
