1892. ] Notes and News. 103 
calléd “stoppers” of the cells in the thallus of cian callitricha have 
waco Segoe to the proteid ies except that they do not dissolve 
e action of a Sears nt ferment. He aman: them of 
peoteid nature, allied to a 
i th.. They nev 
more than one nucleus, and the lar. sie granules of caoutchouc, which 
Soon make their appearance, finally coalesce into a single mass, which 
a when the tissues are broken, the aran a silky thread. 
t. Weiss soit these cells as a primitive form of latex cells, similar 
to those from which the more yeeros e ones of the ot Euphor- 
biaceze may hay ve been derived.— Gard. Chron., Feb. 6 
ip CONTRIBUTION to the cence and function of tannin is made by 
-0re in the seventh paper of his series: Studies in vegetable 
3 The summary is hare pun 
a ler’s test for ammonia is a valuable aid to the ee in He 
€cting with certainty and rapidity the presence of tannin and tann 
a Plants. Other fluids having caustic potash for a basis are alsd 
800d reagents for tannin. 2. Two chief kinds of tannin are to be dis- 
variety is turned yellow Th Z 
: , . ellow substance just men 
son readily diffuses thr ough. i the be wall; this effect is to be 
wil d to the caustic potash, for alkaline solutions, even the weakest, 
act in the same wa Here we have a provision, by the ai of 
N act as a 
va 
the nutrition ef saprophytes,. wit ‘the metabolism of green plan 
1 
Journal of the Linnean Society xxvii. 527 
