D 
UNITED STATES DEPARTMENT OF AGRICULTURE, 
BUREAU OF BIOLOGICAL SURVEY, 
WASHINGTON, D. C. 
July 6, 1915. 
Mr. Alex Wetmore, 
Corinne , Utah. 
Dear Mr. Wetmore: 
The box of silt from the bottom of the White Mountain Lake came 
to hand and I asked Doctor Mann to make a cursory examination of it 
at once, and he reports that it is simply rotten with diatoms. There 
are millions in it and apparently some extremely interesting species. 
He desires me to thank you for giving him an opportunity to examine 
this material. He will presently put the sediment through the usual 
i 
-poet-preparat ion, and then mount a collection of the diatoms for the 
permanent custody of the National luseum. Any further contributions 
of like character from other localities will be joyfully received 
by Mann and carefully attended to. 
Very truly yours. 
