93 
Opuntia, Mammillaria, Echinocereus, Echinocactus and Cereus 
were the principal genera, and the living specimens secured were 
shipped from Yuma and are now included in the plants growing 
in the glasshouses here. Some successful sa tog sane studies 
were also made, by which the aspect of the adult individuals wa: 
recorded and the general appearance of a venation of the 
region preserved. 
The upper valley of the river had recently received a maximum 
Fic. 23. Echkinocereus in gravel mesa near Ehrenberg, Arizona, 
amount of rainfall, in consequence of which the areas near the 
river were of an aoe biked . hue due principally to 
the multiplication of th er of plants of a few small annual 
species. Among other nee 2 in distribution the giant 
cactus (Cereus giganteus) was seen to extend as far north as the 
mouth of Bill Williams Fork and to cross the river here into the 
mountains of California. While the botanical recognition of this in- 
