i(,o 4 ] MAC DOUCAL— DELTA AND DESERT VEGETATION 59 



ment being compared before being taken into the field and after its 

 return with other instruments for standardization. The data given 

 below are corrected results, not direct transcripts from the notebook. 



Slat ion 1. 



Camp on dried mud flats on shore of Rio Colorado a kilometer 

 below international boundary in Baja California; observations taken 

 twenty feet from margin of bank amid willows and poplars; wind 

 blowing offshore; sec fig. 1. 

 Jan. 28 



Slat ion 2. 



Camp on small island in great bend 33 km downstream from Yuma, 

 covered with a dense grove of Salix except at one end. 

 Jan. 



Station 3. 



Camp at lower end of high mesa bank below La Grulla, Sonora; 

 observations taken at a point 6o m from margin of bank 13™ in 

 height, constituting bank of river, among bushes of Covillea, Ephe- 

 dra, etc. (fig. 2). 



