368 NAGELI. 
persisted paar years later, after his own observations might have 
put him on the right track. In spite of these drawbacks, an 
femerione: amount of valuable algological work is embodied in this 
book, n that on the unicellular Algse which appeared two 
years eee e 
Niageli now began to take part in the University teaching of 
Botany, beoprning first Privat docent, and afterwards Extraordinary 
In 1852 he returned to Germany as Professor of Botany at the 
Haiwassiby of Freiburg. Whilst holding this post, he carried out, 
in conjunction with Cramer, those famous cpa which appeared 
theories mark an epoch in Physiology, sci they ~oi not stood 
the test of later investigations, Other researches of fundamental 
importance contained in this volume, aa whi =e are the iseek 
work of Nageli, are those on the primordial utricle, on diosmosis, 
on the development of vegetative organs of eps i laa and on 
the development of the leaf in Sphagnum and in A 
5, Nageli became Professor of General Botany at the ae 
Polytechnil in Zurich; but he did not long remain in his na 
country, for in 1857 he was appointed to the important Cetenin 
Professorship at Munich, which he held till his death. 
m 1858 to 1868 a new series of investigations appeared 
largely the work of Nageli himself, in the Contributions to Scie 
Botany.t The first number of this publication contains his “chief 
aper: on the wth of stem and root in vascular 
elie, and on the arrangement of vascular bundles—a work which 
still remains the chief autherty on the general distribution of the 
vascular in plants. 
Passing over several interesting works, we may mention sha 
the ramet number of the Beitrdge iucludes two more anatomi 
masterpieces: the research on the growth in thickness of ee 
Sapindacee, and that on the origin and growth of roots, published 
in conjunction with Leitgeb. 
e may here cite one more anatomical work, which was 
published Saechaes during the same period,—that on the sieve- 
tubes of Cucurbita,t—which ig one of the most valuable of the 
earlier Soraya to our knowledge of these important con- 
dusting. orga: 
= ae series of works belonging to this period stand in 
sees 5 the views brought forward in the book on starch- -grains. 
: aoe Fey i einzelliger Algen. Schweizer Gesells. Naturwiss. Denk- 
+ Beitriige zur Wiss. Botanik, 1858—68. 
ee Ueber die Siebrohren von Cucurbita Sitzungsberichte der Miinch. Akademie. 
