HARRIS AND KUCHS : OBSERVATIONS ON POLLINATION. 31 



duces as many as 125 racemes. Allowing the same low aver- 

 age of six pods to the raceme, it will be seen that on a plant of 

 this size there will be produced in the neighborhood of 40,000 

 seeds. 



Only a very small proportion of the ovaries fail to develop. 

 Out of the forty-one racemes observed in live plants, taken at 

 random in different localities, results were obtained as follows : 



Plant 1, 5 racemes, 53 pods, 4 failed. 

 " 2, 5 " 42 " 3 " 



" 3, 9 " 55 " 5 " 



" 4, 11 " 91 " 6 " 



" 5, 11 " JL21 " _5 " 



41 racemes, 367 pods, 23 failed, or 6.2 per cent. 



According to these figures, not more than 6.2 per cent, of the 

 ovaries failed to be fertilized. 



While Cassia chamsecrista is usually abundant in Douglas 

 county, owing, probably, largely to the severe drought, oppor- 

 tunities for study were not nearly so favorable as for Solauum. 

 The material studied was found growing, for the most part, in 

 somewhat shaded localities on the banks of Lake View. 



Professor Todd has given very well the points in the struc- 

 ture of the flower of this species. He says : "The points that 

 are of interest to us are the sickle-shaped pistil, the stamens 

 with long, rigid anthers opening by terminal pores, and the 

 most of them pointed toward the incurved petal, which is al- 

 ways on the opposite side from the pistil." 



The flowers are arranged in small clusters a little above the 

 axils of the leaves. In some cases the axillary bud also de- 

 velops into a flower cluster. The axillary clusters have been 

 considered separately in the calculations made upon the condi- 

 tions of the flowers. 



Owing to the lack of material, Professor Todd was unable to 

 determine any definite law governing the arrangement of the 

 flowers in C. chamsecrista. This the writers have attempted to 

 do. The determination of any law governing the order of de- 

 velopment of the flowers in a plant like C. chamn crista, where 

 they are arranged in clusters developed from buds produced on 

 the main axis, and the development of which is probably accel- 

 erated or retarded by various conditions, is much more difficult 

 than in S. rostratum, where they are produced on a definite 

 raceme, which is early differentiated from the terminal growing 



