NATURE STUDY. 
148 
and Insectivorous ( Carnivorous) Plants, which in various 
ways add animal food to their diet. 
The next and final article in this series will treat of a 
specially interesting and also rare partial symbiot. 
Tripoli Powder in Newbury. 
BY WIUUIAM H. HUSK. 
In the picturesque town :>f Newbury just over a hill from 
Take Sunapee, lies a little sheet of water, snuggling cosily 
among the hills. P'or years it has borne the name of Chalk 
Pond. It is comparatively shallow, holds a few fish, and 
contains a small, rocky island on which boys like to camp 
in summer and play Robinson Crusoe. 
The peculiar name is given because of a deposit that cov¬ 
ers the bottom, which, upon drying, is of almost chalky 
whiteness. A visit to the pond last summer and an exam¬ 
ination of the deposit with a compound microscope showed 
that the “chalk” is diatomaceous earth. It is not of very 
recent deposit, as the shells are nearly all broken. Thus 
comminuted by nature, it is of exceeding fineness and is 
already in good condition for a polishing powder. If of 
sufficient depth the deposit might have some commercial 
value. 
