IOWA ACADEMY OF SCIENCES. 89 



of more frequent occurrence than in the eastern region. The 

 stronger winds and drier climate would cooperate in effecting 

 the transportation of larger quantities of alluvium, which would 

 also be somewhat coarser and more siliceous. The frequent 

 interlamination of sand with the loess can be accounted for by 

 more violent storm-periods. 



The writer has seen such alternating deposits of sand and 

 loess in Cuming county, Nebraska, near the margin of the Sand 

 Hill country, which clearly show wind-action. 



Much could also be written of the changes which probably 

 took place after the deposition of many of the beds of loess, 

 of the denudation of some of the hills, the modifications of the 

 deposits by erosion, and kindred subjects, the discussion of 

 which in connection with this question would be legitimate and 

 desirable, but this would extend this paper beyond reasonable 

 limits, and is therefore postponed. 



The consideration of the facts herein brieflj'^ presented leads, 

 then, to the conclusion that the loess is of seolian origin, and 

 that it was dej)Osited principally in forests and to a lesser 

 extent in dense growths of smaller plants, while proportion- 

 ately small quantities only were carried directly into the waters 

 and there deposited. 



PERFECT FLOWERS OF SALIX AMYGDALOIDES ANDS. 



B. SHIMEK. 



A native specimen of Salix amygdalokles Ands. growiag in 

 Iowa City, produces peculiar flowers which seem to be worthy 

 of mention. 



Whereas all Salicaxeae habitually produce dioecions flowers, 

 this specimen has, for at least three successive seasons, borne 

 flowers most of which are perfect. 



The accompanying figures will give a clearer idea of these 

 peculiar flowers. 



The hairy bract is shown at the extreme left; next to this is 

 the narrow dark honey-gland (there are really three such glands 

 in line in each flower) here occupying an unusual position, as 

 in willows the honey-gland is normally in the axil of the pedi- 



