1872.] , | [Kneeland, 
of overlying ice, from the concentric structure of the granite, which 
has been remarked by all observers throughout this region. 
If the valley was not formed by water or ice, its width (on an aver- 
age, half a mile,) the absolute non-correspondence of the two walls 
every allowance being made for subsequent erosion, and its depth, 
would prevent us from regarding it as a geological fissure; we can 
form no idea of a force which could separate these immense Sierra 
ranges to the distance of half a mile. Being east and west in direc- 
tion, great and little Yosemite and Hetch-Hetchy, and transverse to 
the line of upheaval, they cannot be considered as the result of 
folding. 
Prof. Runkle said, in company with Mr. John Muir he had 
studied the Yosemite Valley cursorily during the past sum- 
mer, and that he thought Dr. Kneeland correctly explained 
the origin of the peculiar domes and half-domes. : 
After some discussion on this subject, the Society pro- 
ceeded to ballot for a Recording Secretary and Librarian, 
which resulted in the election of Mr. Edward Burgess to 
those offices. 
The gift of alarge boulder of jasper and iron from the 
Mass. Institute of Technology was announced, for which the 
thanks of the Society were voted. 3 
Section of Entomology. February 28, 1872. 
Mr. C. 8. Minot in the chair. Ten members present. 
Mr. Gurdon Saltonstall was elected a member of the Sec- 
tion. 
Mr. James Boll exhibited a beautifully prepared collection 
of insects taken by himself during the winter, including eight 
species of Diptera, a beetle from the Juniper, Desmiphora 
tomentosa ?, several Lepidoptera, Gracilaria, Lithocolletis, 
