Mineralogy and Geology. 133 
will, if continued, produce solid asphaltum; and this whether the 
petroleum be of class _4 or B, Asphaltum and pyro-asphaltum 
. 
found in rock-cavities may have been thus formed; but he is in- 
_ Class is found, except naphtha, pyro-asphalts and pyro-schists. 
_ Light Nah ieee of a beautifui green color pass through every de- 
either contain paraffin or yield it on distillation. Study of these 
deposits had convinced him that even in that warm climate, such 
1°0165, 1:0855 per cent of nitrogen in the three samples; one of 
_ Mmaltha gave 5645 per cent. Three samples of Pennsylvania oil, 
ple 
sy cent. A sample of Mecca oil gave ‘230 per cent, and one from 
W. M. Gasp. pp. 300, large 8vo, with 36 lithographic 
Published by authority of the Legislature 
California.—The descriptions of the Cretaceous fossils in this 
l Mr. Gabb are in continution of those of vol. 
d 
luding some new genera, an a i 
Sonora, Mexico. Prof, Gabb has been led by his investigations 
