Geology and Mineralogy. 59 
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paleontologist of this survey, and he took the field at the begin- 
ning of the past season, continuing his labors until its close. He 
has pursued his researches with such success as to demonstrate 
the necessity of continuing this class of investigations by various 
lines of travel across what is generally known as the great Rocky 
Mountain region, especially those portions of it that have been 
surveyed, as well as those in which the surveys are now in pro- 
Rivers; thence, crossing Green River, he pushed his investiga- 
tions westward along the southern base of the Uinta chain, as far 
as Great Salt Lake. Thence recrossing the Wasatch Mountains, 
he carried his work eastward across the Green River basin. 
continuous within what is now that part of the continent, from 
the earliest to the latest of the epochs just named. uring the 
progress of the field work, large and very important collections 
of fossils were made, which are now being investigated. : 
Messrs. S. H. Scudder of Cambridge and F. C. Bowditch of 
ton spent two months in Colorado, Wyoming and Utah, in 
making collections and observations in fossil and recent entomol- 
ogy, with very gratifying results. Mr. Scudder is making arrange- 
ments to add materially to his labors in this department, in connee- 
tion with the survey. : 
Professor Joseph Leidy spent some time during the season in 
Green River Basin, making observations and collections for his 
large work on Rhizopoda, which is to form one of the quarto 
volumes of the survey. : 
e botany of the survey was represented during the past sea- 
son by the two great masters, Sir Joseph D. Hooker, Director of 
the celebrated gardens at Kew, England, and Professor Asa Gray 
