XIII, C. 4 
Shaw: Microtechnical Methods 
259 
For cases in which very small areas suffice for the count 
a circle of 314 square microns was used, the radius being 10 
microns, and the corresponding constant, k, is 100. This served 
for counts of cells of daughter coenobia within the parents. 
For very large coenobia with widely separated cells the area 
taken for count was 31,416 square microns, the radius being 
100 microns, and the constant, K, 10,000. 
