97 
examination of the great Sonoran coast mesa or plain, which 
stretches far to the southward. The slight seasonal rise in tem- 
perature had started many deeply-rooted herbs and shrubs into 
Arrival of expedition at Colonia Lerdo, Sonora. Towing boat a ce 
Fic. 17, 
by line to masthead. . The farther shore is covered by « dense ae of you 
trees of Sa ix. 
activity and many interesting additions were made to the collec- 
tions. 
During the entire,expedition numerous records were made of 
the temperature and humidity, and the relative humidity of the 
