STRUCTURE OF LATHREA SQUAMARIA, 261 
a wall of tissue lining the cavities, and the starch-bearing 
The following micro-chemical reactions were noted in the small- 
celled tissue lining the cavities:—Gardiner’s test for tannin, @ 
gave a copious yellow Beenogees the presence of this substance 
was also proved by the ir n and potassic besides tests. The 
nuclei assume a bright a ae blue colour when treated with 
ferro-cyanide of potassium and acetic acid, a terwards wash 
m alcohol, proving the presence of nuclein; the same structures 
also contain ir red with sulpho-cyanate of potassium, 
the cell. The proportions of the various reagents were used as 
given by Poulsen.* With dilute potassic hydrate, all parts of the 
plant containing protoplasm become clear primrose-yellow, with 
the exception of the cells forming the compact tissue lining the 
cavities, the contents of hange to a bright orange-brown 
concentrated ammonia gives the same reactions. The yellow 
colour points to the — ‘of tannin, but what the orange-brown 
colour indicates is un ee 
hen 
The eavvition of the leaves do not contain air, as supposed by 
Bowman, but water, having an acid reaction, due to a secretion 
from the stipitate glands, which can be proved by placing a — 
in litmus solution, when the acid reaction first shows — he 
some time with vegetable humus along w ler portions of the 
in several instances, where rat care was Seer in syeene 
the buried portions, not a single dise } 
admitting that a few were eal it is difficult to comprehend 
how so small a number could supply the plant with the — 
endosperm asse the oi 
extracted ye water; but these Burke ae pear a a oa nm thaie 
American Edition... 
* « Botanical — os wae 
t ‘Text Book of Botany.’ nd English Edition, p. 721. 
