CHAPTER VIII. 
A DROP OF WATER MARVELLOUSLY LLLU- 
MINATED. 
T N order to increase their interest in the les- 
sons which he was giving, Doctor Dean had 
requested his young pupils to make a visit to 
the pond and secure suitable specimens for ex¬ 
amination. He thought that this would not 
only afford the pleasure of co-operation and the 
excitement of a pleasant ramble, but would also 
assure them that no special preparation was 
made to secure exceptional examples for illus¬ 
trating the topic under consideration. They 
themselves would gather the wonders, all un¬ 
conscious of their existence until brought to 
their view by the manipulations of their in¬ 
structor. 
It is needless to say that the task imposed 
upon the young men was entered upon with 
pleasure; and they, in fulfilling it, spent half a 
95 
