NAGELI. 867 
Cirsium.* It is important to bear in mind that the minute work 
on species which began with this paper oe pry oat throughout 
the whole of Nageli’s life, at the same tim h those histological 
and physiological researches with which rare seis is more generally 
associated. 
After studying for a short time in Berlin, he settled at Jena, 
and there, in company with Schleiden, his first histological wor 
carried on. I i 
and is re accompanied by the letter written on that occasion by 
g Ge 
the you erman histologist to the great English master 
In the e following year “ yaa of papers, sina histological, 
were contributed by Nageli to Linnea.t Some of these 
focitadion. of the then rralent Schleidenian theory of te06. eal 
During the years 1844~46 appeared the Journal of Scientific 
ead edited by Schleiden and Nageli, but almost wholly the 
work of the latter. During its brief career this journal brought 
before the world an extraordinary series of important researches. 
n 
problems of Natural History; the histological papers on Nuclei 
and Cell-formation, which fret established the general occurrence 
of divisions as the mode of origin of the nucleus of the ri ae the 
algological contributions on Caulerpa orotate on the h of 
Delesseria ; on Polysiphonia and Herposiphonee ; the first pee 
of spermatozoids in Ferns, the great anatomical treatise on the 
growth of the stem in vascular plants: the comiecacar researches 
a growth of the Muscinee ; on the growth and definition of the 
of England. The material then acquired was utilised for his 
a work on the classification of #.{| In this work, full 
justice is done to the great English algologista- of that time, and 
indeed Niigeli all aici his life was fully in sympathy with 
from included the Lichens. His general views o 
algological subjects were much vitiated by his preconception that 
all # are asexual, and by his misunderstanding of the 
reproductive processes in the red sea-weeds, in whi ch he still 
* Die Cirsien der Schweiz. Schweizer Gesell. f. Naturwiss. Denkschriften, 
Band v. 1841. 
t Ueber die Entwicklung des Pollens. Schweizer s Verhandlung, 1841. 
} Botanische Beitriige. Linne: 
‘ Zeitschrift fiir wissenschaftlich. Botanik lee u. Niigeli, 1844—6. 
|| These papers, as well as one on the utricular structure in the contents of 
cells, were translated by Henfrey, and appear in the Ray Society’s Reports rand 
r and 1849. 
q Die neueren Algensysteme, &c. Schweizer Gesells. f. Naturwiss, Denk- 
sehriften, Band ix. 1847, 
