4 8 



BOTAXICAL GAZET1 E 



l.ll'J.V 



In the lower part of the delta, where the river is affected by the spring 

 tides, the cane is partly replaced by a cat-tail "tule" (Typha angusti- 

 folia), which not only lines the shores for many miles, but extends 

 back some distance on areas free from trees, forming dense masses 





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FlG. i. — Scene on right bank of Rio Colorado, Baja California, a few meters 

 from the margin of the stream, io km below Yuma; the conchoidal fractures of the 

 clayey mud are 30-35"" in depth; Salix and Populus in background; Station 1 of 

 hygromctric observations. 



that afford shelter for a number of animals, including a peculiar sub- 

 species of a small mountain lion. 



Large areas throughout the delta which were not covered by trees 

 bore wild hemp (Cassia?) in great abundance. The slender stems 

 reach a height of 3-4™, branch profusely above, and bear numerous 

 pods. At the time of our visit, the plants which were annuals were 



