144 Geiger- — The Development of the Polliniuni and 
The full number of chromosomes was determined only after 
several hundred counts had been made, and Fig. 8, Plate VII, 
showing twenty-four elements on the division spindle seems 
almost conclusive evidence that the characteristic number for 
Asclepias is at least twenty- four. 
C. S. G. 
Cornell University, 
December , 1901. 
