428 The Botanical Gazette. - [December, 
ance. Common blight (Cladosporium fulvum) and root-galls, caused 
by nematodes, are also described and illustrated. The results of va- 
rious preventive measures are given. 
IN A CONTRIBUTION to the physiology of collenchyma (Prings. Jahrb. 
f. wiss. Bot. xxiv. 145) Jonas Cohn finds that this tissue norma y con- 
tains in the cell wall from 60 to 70 per cent. by weight of water as 
i He 
ot 
ao 
— 
nm 
7 
i.) 
= 
re) 
tai a 
a] 
a 
n 
ct 
ie) 
fa 
i=] 
aq 
cy. 
n 
n 
=] 
ig) 
_— 
na 
* 
i@') 
a 
n 
ie?) 
c 
=) 
wn 
ab) 
ay 
wn 
Leena} 
~ 
Q 
cr 
§ 
fa) 
= 
fe} 
Fo 
© 
zs 
& 
however, to discover the relation between the mechanical peculiarities 
and the watery contents of collenchyma, and therefore does not sug- 
gest any theory as to its function. 
a 
conducting tissue of healthy and diseased li 
University; the la oratory as a necessary part of the college equip- 
ment, by Professor William Trelease, Director of the Shaw School of 
Botany; and the methods of geology, by Professor N. H. Winchell, 
seni Geologist of Minnesota. The botanical laboratories are said to 
investigatio 
