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Geology and Mineralogy. 227 
facts of discovery are clearly stated, and, as far as possible, in his- 
torical order, with a severe exclusion of extraneous matters, 
t 
usefulness would be increased by a synoptical table of contents 
and a fuller index of proper names and subjects: e. g., one looks in 
0, volu m 
French work has rarely a good index; but an English translation 
need not repeat this fault. In these days, when gas has com- 
pletely replaced the old-time charcoal furnaces as a source of heat 
in the laboratory, it looks strange to see these historic things re- 
produced from old cuts in the newest French book. B, 8. 
II. GEoLOGY AND MINERALOGY. 
the Chazy, 
Newburg, N ky: by Re Ps 
Wuitrietp. (From a letter to J. D. Dana, dated American Mu- 
“ Little Pond Road” one and three quarter miles southwest of New- 
burg Ferry, where I obtained from the thin shaly layers of the 
limestone, remains of three specimens of Maclurea magna Les., one 
of which is sufficiently well preserved to be unmistakable. 
. Coan does not mention the precise time of this eruption; but, 
Statements j ; i ‘ 
Ga ues Fe Islan Tanea; and, though large, is 
small compared with the area of the bottom of the pit, the longest diameter of 
miles. ; 3. D. D. 
