204 The Botanical Gazette. : {May, 
especially did so in the numerous writings in which he de- 
scribed the arrangements for pollination in flowers. This is 
still a promising field for investigation, and busies. many stu- 
dents, merely to name whom space here forbids. 
he investigation of the phenomena of pollination of 
flowers, and of the striking adaptations between flowers and 
insects, which here present themselves to students, greatly 
promoted the study of adaptations in general. These are 
now comprehended under the general name of biology 
but, under the name of ecology or the study of adaptations, 
would better form a part of physiology. We are indebted 
to Hildebrand, Stahl, VoLKENS (docent in Berlin), but espe- 
cially to Goebel and Schimper, for valuable contributions to 
this subject. The last named has contributed material of re- 
markable value bearing upon the problems of plant-geogra- 
phy. A distinct field of physiology was opened by Véch- 
ting’s striking work on the apex and base of plant members, 
on the inner polarity of the plant body, and on the related 
phenomena of regeneration. 
[ 70 be concluded. | 
Bonn, Germany. 
