470 Scientific Intelligence. 
is the least satisfactory. It covers but 60 pages, which is a small 
allowance considering the variety, extent and peculiar character 
of the ore-deposits. Mr. Phillips s visit to the country some years 
since has aided him in writing up the subject; but another visit, 
preparatory to the present treatise, would have secured for it 
greater thoroughness and abort since the new developments 
ee the past decade have bee : 
Lesquereux on the Coal Flor ora ep Pennsylvania and the 
United States.—The third and last part of the Coal Flora of the 
Pennsylvania and the United States, by Leo Lesquereux has been 
published, as volume III P, of the hi. ata of the Second Geolog- 
ical Survey o * Pennsylvania. It is a fine volume of 280 pages 
with 24 8vo. plates, completing Ne work in 976 pages and 111 
plates. The first twe A ape in 1880, have been widely 
distributed and are now well-kno This last one adds deserip- 
figured, 
species already ’ published, a table of species referred to forma- 
tions, an —. of all the species found at each locality 
mentioned, and a ised index for the three volumes ie generic 
voted to the description of Californian rocks, but is in fact 
principally a discussion of meteorites. It contains an extended 
discussion, in the successive sections of chapter I of the structure 
of the earth, the origin and alteration of rocks, and of their min- 
eral constituents, the value of chemical analy of rocks, the 
methods of chaeeiisatiog based upon mineral composition, geo- 
logical age, with the conclusions adopted by the author as to the 
true method of sie ae ~~ Chapter IT takes up 
chapter IV the basalts. The hire ” described under the above 
heads are mostly meteorites sles the author has collated with 
t 
has added to them observations of his own. In regard to the 
origin of meteorites, he regards “ the su, or some similar body, 
their sao qo 9 le source.” The tables in the close of the vol- 
ume, cov pages 1 to 33, contain a long series of analyses of 
chromite iat ploonites showing their close relation to each other, 
and also of meteorites and terrestrial rocks, mostly the former. 
ions colored plates are se executed. 
Carboniferous Cockroaches and Myriapods.—Professor 8. 
H. Sondder has a paper in gi Memoirs of the Boston Society of 
