Geology and Natural History. 519 
Landesdurchforschung von Bohmen, II Th.).—The researches of 
Boricky extend over the whole range of basaltic eruptions in 
northern Bohemia, embracing some 300 localities. The memoir 
contains descriptions of all the important varieties, based upon an 
examination of 800 microscopic sections, and 
h 
discussed, One of the most interesting chapters is upon the Para- 
genesis of the secondary minerals of the basalts. 
The author distinguishes the following varieties of the basalts : 
I, Magmabasalt ; II, Nephelinbasalt; II, Leucitbasalt; IV, Feld- 
sparbasalt ; achybasalt ; VI, Tacylybasalt. 
8. Ueber die Verbreitung des Kali und der Phosphorsdure “a 
O i 
ry 
Ostracoids of the Pliner, by Dr. Aug. Ritter von Reuss, The 
text is accompanied by nine plates. _ : 
10. Proceedings of the California Academy of Sciences.—The 
first volume of the Proceedings of the Academy, containing a 
number of valuable original papers, has been reprinted, and a com- 
plete series of the publications of the Academy may now be had. 
see m opes of the peaks kno 
“Walnut Mountain,” and “ Max’s Patch,” in Cocke County, Tenn., 
and Madison County, N. C. e rock is said to occur also in 
