85 



A SIMPLE TROUGH FOR POND >-IF;^v 



By J. T. Cook. 



{Read December 2Sth, 1915.) 



Figs. 1, 2. 



The little piece of apparatus figured below is intended for use 

 as a- trough for pond life, and is suitable for low powers. The 



Fm. 1. 



Fig. 2. 



following details may enable any one so desirous of constructing 

 a number for himself. Take a glass slip, 3x1 in,, and cut it 



