378 Bibliography. 
ities of the iron. The crystals of the gray cast iron belong to the octa- 
hedral system, and present themselves under the forms of several of 
its classes; their minuteness is extreme ; when the form is cubic, the 
linear dimensions are not over ;s$55 of an inch, and the weight of 
a crystal soyadoo00 Of a grain. 
- The crystals of the white cast iron are more generally six-sided 
prisms, &c. A work involving innumerable details must be. ully 
perused, in order duly to appreciate its value, and this course we, in 
the present instance, strongly recommend to all those, who from a 
scientific or practical interest, are disposed to study the history of the 
most important of the metals—for to iron is man indebted for the high- 
eat attainments i in civilization. Its natural history, and its chemical and 
bine a series of attractive results hardly equal- 
led. i nacomeaiieacienidnn in proportion to the importance of this 
metal to the human family, it is by the bounty of the Creator, diffused 
over the world with a profuse liberality, which esd it rien soe. § 
where within the reach of man. | 
Mr. Alexander has set an example worthy of imitation, by a full and 
able exhibition of both science and practice in relation to iron, and we 
trust that this is only a prelude to other labors of the kind, — 
aan to the honor and Geren of ee one 
i 
ae Repos on, the peaeretni ‘einbiitt of mcg compri- 
sing the Mollusca, Crustacea, Annelida, and Radiata. Published by 
Se ee D. Bro. pp- 978. Can 
mas Mass. 1841. ‘ 
- Reports on the Hin Micdonies Plats eiit Qutitraptis ae 
the first by Rev. Cuzster Dewry—the last ay Eewezen — 
8vo. pp. 277 and 86. “Cambridge, 1840. 
_ We have already been presented with dietepdienrét By Storer 
P , reptiles and birds, of the state of Mas- 
sachusetts,* and which we were given to understand, would be fol- 
eer eins titles stand at the head of this notice. “The 
nithh<aewReon 
ology, and of Dr. Haris (noe yot published) on the insects, has thrown 
tific world, and all lovers of nature, a body 
of accurate and useful information hitherto-unequalled in the annals of 
Ba one lRn ramerne 
aes Ree ier, ee forth; and 
amis a sepa 2 
| eae ails 
