Figure 7. (A and B) Another organized element from preparation of Claus and Nagy 

 (C and D) Ragweed pollen grain. The line is 20 m in length. 





^ir 



B 



D 



Figure 8. (.1 and B) 'F'wo different organized elements from prej)aration of Claus and 

 Nagy stained with i'eulgen reaction. (C and D) Starch grains stained with PAS reaction. 

 See text for discussion of significance of staining. The line is 20 /u in length. 



506 



1 



