101 
devoid of vegetation. In a hot spring near one of these 
volcanoes was found an alga hitherto reported only from 
geria. An ascent was made of an extinct cone to the t- 
ward of the lake known as “ Cerro Prieto” and several ee 
including an Astragalus were taken from the floor of the old 
ater. 
Volcano Lake lies on the crest of the gentle ridge which 
separates the main portion of the delta from the Salton basin and 
we had expected to make our way from this by New River back 
into the United peek into the lake formed by the floods in the 
bottom of this basin. The direct channel leading from the 
southwestern corner of the lake into New River was so shoal 
in places, however, that this route was not practicable and the 
time at our disposal did not allow us to prospect the circumfer- 
ence of the lake for a navigable channel. Mr. Sykes therefore 
walked from our camp into Calexico, a town on the international 
boundary, taking out mails and securing a team at the Enramada 
cattle camp by the courtesy of the foreman, Mr. Allison. We 
arrived at Calexico on the evening of April 28 and found New 
River swollen beyond its banks and were compelled to transfer 
our outfit across the stream inasmall boat. The following day 
was spent in packing and shipping specimens and in settling up 
the business details of the expedition. From Calexico I pro- 
ceeded to Yuma, and found there several plants awaiting ship- 
ment including a large Agave brought in from southern Arizona 
at the request of Mr. Herbert Brown, to whom we were indebted 
for many other favors also 
Briefly stated the atin travelled about 600 miles on the 
Colorado River and on Hardy's Colorado by boat, and about 
300 miles by land. A critical examination was made of a large 
portion of the delta and of the contiguous deserts with regard to 
the effects of a maximum rainfall. Collections of living plants, 
photographs and herbarium specimens were made in California, 
Arizona, Sonora and from the Cucopa Mountains in Baja Cali- 
fornia. Some parts of this region had not been previously visited 
by a botanist. Not the least important of the results secured by 
the expedition are the records of observations as to topographical 
