Be te 0 ae bs ee 
Geology and Natural History. 319 
I say in my work, the fullest satisfaction in his theory for the 
origin of atoll and barrier forms of reefs, and in the array of facts 
of his own observation which illustrate the growth of coral for- 
mations. 
2. The Mi ennatosbeal and Geological COneree of the late Dr. 
Gerard Troost, formerly of Nashville, Tenn., have been pashan’ 
for the sum of $20,000 by the Trustees of ‘the Public Library in 
the city of Louisv “ile, Ky. Dr. Troost’s well known cabinets, the 
fruits of more than forty years of industriows Pega eee 
13,582 specimens in m ogy, 2 8, bet 
2 000 and 3,000 rock specimens, hoses a Srnitanaele: vollection 
of modern shells and some archeological specimens. € miner- 
alogical collection is catalogued gee: minutely described in two 
large manuscript volumes, 
3. Mineralojical Co tian: of G. vom Rath, of ee 
No. xiii. (Pogg. Ann., clii, 1874.)—This new num umber of V 
Rath’s mineralogical papers "contains notes on the crystallization 
of Tridymite; on a crystal of calcite from the amygdaloid of the 
Lake Superior region; a peculiar twinning of rutile and hematite ; 
represent remarkable twins of the s cies trid nite The new 
zeolite , Foresite, is orthorhombic, and — stilbite in form, with. 
a very” distinct, pearly cleavage para o +i, ctahe dral faces 
on the summit make an oo of about reg with 7% and 132° with 
0. 
a 
4, ae Annual bart of the » Ga tegion: Survey of Indiana, 
made during the year 1873; by E. T. Co ed State Geologist ; 
assisted by Professor Joun CouLETT, Profe ‘ ORD 
and Dr. G. M. Leverre. 494 pp. Svo, ae four maps.—Thi 
Volume opens with a Report on the Vienna Exposition of 1873, to 
which Mr. Cox was Commissioner from Indiana and a chapter 
on Spiegeleisen Manufacturing by artmann. After these 
follows the Geological Report, in which the es of several of 
the counties of the State is described, and information is Leaven 
a various mineral produ cts of economical importance, 
— anal te 28 of iron ores, ae nas and hydraulic cement rocks. 
ic Fossils. Vol. Ul, Parti. By E. Brirrnes, F.G.S., 
ees of the ree Survey of Lesedn under ALFRED 
C. Setwyn, Director. 4 pp. 8vo, with 9 eheoemphtc plates of 
figures of fossils. —Mr. Billings continues in this volume the pub- 
lication of his very valuable paleontological labors connected with 
the Geological Survey of Canada. It treats of fossils of the Gaspé 
Series of rocks (which are Upper Silurian and Devonian in age) ; 
