126 PROCEEDINGS OF THE CALIFORNIA 



Prof. Davidson presented two photographs of the sun, and 

 described Clark's new process for obtaining sun-images by a re- 

 flector as very superior to the old method. 



Dr. Blake mentioned that on the 12th of June a hailstorm occurred 

 twelve miles south of Pleasanton, across the Bay, in which stones 

 fell so large as to kill birds. It was followed by a rain-shower with 

 thunder and lightning. 



Dr. Stout exhibited a piece of rock, supposed to be basalt, found 

 in a well seventy feet deep in this city. Water was struck at 125 

 feet in the well mentioned after passing through the hard rock into 

 slate. 



Prof. Whitney considered it to be the very hard, metamorphic 

 sandstone, not uncommon on this peninsula. 



Adjourned Meeting, July 11th, 1870. 

 President in the Chair. 



Dr. C. D. EUinwood and J. F. Gray were elected resident mem- 

 bers. 



Donations to the Cabinet : The President presented a stuffed 

 specimen of the " Shovel-nosed Shark," Rhinobatus productus 

 Ayres, found in this bay. Specimens of Unio spatulas, from Wis- 

 consin River, by I. A. Lapham, through Dr. Cooper. 



Mr. Bloomer exhibited specimens of Lilium closely resembling 

 L. superbum, found in Butte County by Mr. Brooks. 



Donations to the Library : A beautiful colored drawing of Mho- 

 dodendron Calif ornicum, a very rare shrub, found at Waddell's 

 Mills, near Santa Cruz, and drawn by the donor. Dr. Saxe, of Santa 

 Clara. Annual Rept. of Mus. of Comp. Zoology, Cambridge, Mass., 

 1870, 1 vol., 8vo. 



Col. Williamson, U. S. Engineers, asked for information as to 

 how to prevent the movement of the sand-dunes around the Light 

 House at Toke Pt., Cape Shoalwater, Wash. Ter. He stated that 

 the building was liable to be undermined by the blowing away of the 

 sand. 



