318 BOTANICAL GAZETTE [APRIL 
In the fall of 1909 and again in 1910-1911 experiments were 
conducted on the effect of bog water on the production of root 
hairs on cuttings of Tradescantia. The experiments reported in 
the following table were carried out in 1910-1911 in 150 cc. glass 
bottles with extra wide mouths. 
TABLE I 
THE PRODUCTION OF ROOT HAIRS ON TRADESCANTIA IN BOG WATER 
RoOoT HAIRS 
No. or 
bata Slightly Much 
U! 
Normal stunted stunted None 
PRE DO ee. 16 a 3 9 4 
ICY DON PGs 10 ce t 9 Pa 
wecmtieroy bow... <........- 10 ~ 3 6 I 
Cae eS ro, 5 oe i 2 3 
Green Lake bog. oie. ik. 10 10 oF Hs 
Mount Constitution bog...... 3 a 3 
It will be noted that the Green Lake bog is the only one whose 
water allowed the production of root hairs that were normal as to 
length and abundance. It seems evident that this lack of toxic 
effect is a result of drainage. Of the 44 plants grown in water 
from undrained bogs, 8 plants (18 per cent) produced no root hairs, 
while 29 plants (66 per cent) produced root hairs that were much 
stunted, and 7 plants (16 per cent) produced root hairs that were 
slightly stunted. 
The above table is based on the roots produced within the first 
14 days; these roots were invariably shorter than those produced 
in tap water within the same time. The new roots that started 
after that time approximated the length of the roots of plants grown 
in tap water and produced root hairs that were longer and much 
more abundant, in many cases approximating normal. The tops 
of the bottles in which these experiments were carried on were not 
closed, the surface of the water being exposed freely to the air. 
DAcHNowsKI (2) found that aeration reduced the toxic effect of 
bog water from Cranberry Island (Ohio). 
In addition to the tests made on bog water and tap water the 
following tests have been made on other waters of the region: Echo 
