88 Fresh-water Biology 



Study 24 



APPARATUS AND METHODS FOR QUANTITATIVE STUDY 



OF PLANCTON 



Quantitative studies of placton are so time consuming as to be unsuited to the work 

 of an elementary class program, but the apparatus and methods used are very interesting, 

 and the biological results, still more so. It is proposed that these be shown in demonstra- 

 tion when materials are locally available. 



Study 25 

 FISH-CULTURAL METHODS 



If a fish hatchery can be visited, the superintendent (or other qualified person) may 

 be engaged to give a demonstration of the methods used there: 



1. In stripping and in fertilizing (inseminating) eggs. 



2. In incubating eggs, both heavy and light. 



3. In caring for and feeding the fry. 



4. In providing for the next-building fishes. 



5. In transporting and planting fry and fingerlings, etc. 



