130 BOTANICAL GAZETTE [auveust 
In the ,{y and ,.\, solutions no growth whatever occurred, 
and at the end of the first twenty-four hours the tips of the 
roots were very soft and flabby and were considered as dead. 
In the ,)\, solution a growth occurred in the HCl and H,SO, 
solutions for the first twenty-four hours, but the second twenty- 
four hours showed no additional growth, while the roots were 
very soft and flabby. In the HNO, and HBr no growth what- 
ever took place in the siyo SOlution. In the me solution the 
seedlings grew for the entire forty-eight hours and at the end of 
that time the roots were very rigid and did not show any symp 
toms of poisoning. 
It is worthy of note here that in case of the seedlings in the 
stoy Solution a large number of lateral roots were formed before 
the root was killed. The delicate cells of the root tip were the 
first to be affected by the poison, and thus having its mail 
growing point destroyed the plant was stimulated to i a 
duction of lateral roots in its struggle to withstand the effects be 
the poison. Another point which cannot be overlooked is the 
fact that in the tévy Solution of HCI the roots of the seedlings | 
Were covered with a dense growth of fungus at the end se : 
experiment. The species of the fungus was not determined. >? 
far as known from experiments it is true that fungi generally 
are able to withstand stronger solutions of poison that ser 
Plants. Penicillium, for example, will grow in a comparatlt 
strong solution of CuSO 4 Asolution of ,N, acetic acid, “e 
standing for some time in the laboratory, was found to be ce 4 
with a dense growth of fungus, the species of which Wa" 
determined. ae 
Two seedlings of Zea Mais were placed in each of the _ 
MS recorded in the following table, and the growth rece _ | 
at periods of twenty-four hours. ; of 
From the degree of concentration at which the seedling 
Pisum satioum were killed it was thought that the oa 
8200 s4oo and tzs00 Ought to show the strength of $0” 
which these seedlings would withstand, and so at first ont tt 
tions of that Strength were used. In all of these, howeve™ ” 
tio 
