144 T"R AMERICAN MIDLAND NATURALIST 



No. I towing taken from the surface. 



No. 2 towing taken from the bottom. 



No. 3 sample was taV en by pumping from the bottom into a 

 net which was tied at the narrow end or outlet of the pump and 

 then the net was carefully washed. 



No. 4 towing taken from the 'bottom. 



Station 2. . 



Located just o:T the dock. Depth 10 feet. Turbidity 9 feet. 



Temperature. *No. 5 deep towing off dock. 



28 C. at surface. No. 6 surface towing off dock. 



27 C. yi distance to bottom. No. 7 J!^ distance to bottom from 



27 C. at bottom. dock straight across to other side. 

 No carbon dioxide present at surface. No. 8 surface towing from side to side. 

 2 c. c. per M. at bottom. 



i}4 c. c. per M. 7 feet below surface. 

 7 c. c. per M. 5 feet below surface. 



Station 3. 



At entrance of undercut from, kale through which undercut 

 the pond is kept supplied Vv^ith water. This pointls supposed to I e 

 the deepest part of the pond but sounding proved that the pond v/as 

 the same depth throughout. 



Depth .7ft. 4in. 



Turbidity ,-7ft. 4in. 



Temperature. No. 9 deep pond dredging. 



28 C. at surface. Carbon dioxide. 



28 G. yi distance to bottom. At surface i c. c. per M. 



27 C. at bottom. At bottom 5 c. c. per M. 



Sunfish were found in the pond and also one stickleback. These 

 fish had been thrown into the pond l.y fishermen. In pools, cut o.T 

 from the main part we found water beetles and water striders. 

 In pools not qtiite cut off from the shallow pools we found an 

 atundance of algae upon which there were numerous beetles 

 {H ydrophyllidae) and m^any smalksnails. Given below is a summary 

 of the di:Terent towings with forms, c[uantity and quality found h\ 

 each towing. 



No. I Towing. * No. 4 Towing. 



1. Bosmina .-. i 1'. Ceratium longicorne 24 



2. Diatom- 1 2: Natiplius 3 



No. 2 Towing at bottom. 3. Cyclops. 5 



1. Nauplius - 3 4- Bosmina 11 



2. Bosmina - -— 2 3. Daphnia.... — ..- 4 



