HARRIS AND KUCHS '. OBSERVATIONS ON POLLINATION. 41 



the same time on a cluster, nor was a bud ready to open the 

 following morning ever found on a cluster with an open flower. 

 Thus, cross-pollination between flowers on the same cluster 

 would not be possible, as it frequently is in S. rostratum. 



3. So far as the writers have been able to ascertain, there is 

 no law governing the producing of right- and left-handed flowers 

 on the opposite sides of the main axis. 



4. Various species of insects visit the flowers for pollen. 



5. It seems that pollination is effected in many cases by the 

 transfusal of pollen from the leg of the insect, where it is being 

 carried, to the stigma of the stamen upon which it is supporting 

 itself. The function suggested by Professor Todd for the in- 

 curved petal seems to the writers entirely improbable. 



Botanical Laboratoky, University of Kansas, 

 September 28, 1901. 



