ACADEMY OF SCIENCES. 



211 



Donations to the Library: Die Pacific Geisenbahn in Nordamer- 

 ika, von Robert von Schlagintweit ; Californien Land und Feute, of 

 the same author, by Dr. Stout. Dr. Stout mentioned the important 

 points contained in the volumes presented by him, and noticed that 

 the suggestions made by the author, in his remarks deprecating the 

 reckless destruction of our forests, were worthy the attention of 

 the State Legislative Committee on Forest-trees. 



Dr. Stout, for the Committee on Foreign Publications, submitted 

 a report in reference to the foreign correspondence of the Academy, 

 and, on his motion, the thanks of the Academy were voted to the 

 numerous foreign societies for publications received from them. 



Dr. Stout read a translation of a portion of " L'Homme Tertiare," 

 by M. L'Abbe Bourgeois. 



Mr. Durand read the following, in reference to the specimen 

 presented by him: 



Note on Crystals of Quartz of a red color, by the interposition 



of Cinnabar. 



These crystals are hollow, and present small crystals inside. They have the 

 form of a short, orthogonal rhomboidal prism, having planes on the four obtuse 



angles of the two bases ; planes generally 

 small but sometimes large, and thus chang- 

 ing the general prismatic form into the 

 form of an octohedron. This form be- 

 longs to the orthorhombic system, en- 

 tirely diflFerent from the crystalline system of the quartz. 



Crystals of cinnabar are also found having exactly the same shape, but are 

 not hollow like the quartz crystals. The crystalline form above described, is 



not that of cinnabar ; that crystal may be 

 an example of dimorphous cinnabar, or a 

 pseudo-morph of a third mineral, and very 

 likely this mineral may be sulphate of 

 baryta ; which mineral has not yet been 

 found pure in the California mines, but 

 is quite common with cinnabar in the 

 Spanish mines. This mineral has been 

 found near the surface in the Redington 

 quicksilver mine, in Lake County, Cali- 

 fornia. 



Dr. Blake offered the following resolution, which was unanimous- 

 ly adopted : 



