54 MIDLAND NAT: RALIST 
Unna 
SAU e 
plants in the same stages of development, even after so short a 
time. An instrument then, that would have simple and effective 
workings would save much time and unriecessary trouble in gather- 
ing and examining or observing very minute objects. Then again, 
the best specimens of algae are oftentimes found where the ordinary 
field microscope, with its fittings so complicated, as though it were 
a laboratory instrument, is difficult to be used. It is really neces- 
sary that the different stages of ed be recognized before the 
collector leaves the field. 
The accompanying illustration EROR the contrivance one- 
half size, now used by the collectors of the University in gathering 
