THE WANDERING TAPETAL NUCLEI OF ARISAEMA 463 
been made, and the reports concerning the two species are here pre- 
sented together. 
Material for the study was collected in Indiana in 1914 and 1915. 
That most used was fixed in chrom-acetic acid (chromic acid i gm., 
Fig. 3. Section of anther showing the periplasm, P, composed of the mixed 
masses of protoplasm from the tapetal cells and carrying their nuclei. The 
protoplasmic mass has not yet spread through^ the spaces between the dividing 
pollen mother-cells nor filled the anther cavity. X 280. 
