596 General Notes. ; [June, 
d'Orbigny referred to the triassic in Bolivia are by Brackebusch 
placed in the Wealden or Neocomian. In these Mesozoic strata 
occur many petroleum springs, and throughout Jujuy and Salta, 
in Bolivia, and probably below the diluvium of the Gran Chaco, 
‘the character of the formation is such that Brackebusch styles it 
the “ petroliferous formation.” A small basin near Jujuy has 
Post-tertiary strata, with beds of lignite and mastodon remains. 
Eruptive rocks occur in many localities, and gold ore is found in 
the beds of the streams which flow from the Sierra, Cabalonga. 
Part 1 of the “ Grand Atlas of the Second Geological Survey 
of Pennsylvania,” with fifty sheets imperial folio, has been pub- 
lished at Harrisburg. The two “ Prix Vaillant” of the Acad- 
emie des Sciences de Paris have been given, the first to M. Gustave 
Cotteau, for his researches among fossil echinoderms ; the second 
to M. Emile Riviere for his work in prehistoric anthropology. 
M. Cotteau has published more than 1000 plates of echinoderms ; 
and for thirty years has been known asa paleontologist. The 
results of the researches of M. Riviere have been published in a 
work entitled “ L’antiquite de l’homme dans les Alpes Mari- 
times.” M. Dieulafait is now engaged in studying the deposits 
of iron, manganese and zinc which exist around the “ Plateau cen- 
though the shape and nature of the zocecial avicularia are charac- 
ters of the greatest value, yet their presence or absence cannot be 
made a specific distinction, as there are a large number of cases 
where specimens are found with none or only a few such avicu- 
aria, whereas on other specimens of the same species they may 
occur abundantly. 
MINERALOGY AND PETROGRAPHY:.! 
sion maxima along which the molecules can be parted only with 
the greatest difficulty, while they may be made to slip or slide 
over each other as easily in this as in any other direction. The 
ce eo lited by Dr. Geo, H. WILLIAMS, of the Johns Hopkins University, Baltimore, 
