286 Miscellaneous Bibliography. 
losophy under the three heads, Pressure, Motion, and Machines 
and Sources of wits icy Power; the second, Sound, Light, and 
Heat, with an appendix n Ener Electricity and tism 
ries on chemistry. : 
Full heer of difficult points are not to be e in an 
elementary work; yet, if attempted at all, they should not, in our 
view, be s0 defective and i inadequate as is that of the he difference 
between Newton’s theoretical and the observed velocity of sound, 
8, part 
= The k is well furnished with illustrations, pire ie 
tions, and indexes. 
. Braithouite’s omc of Practical Medicine and Surge 
Part LVI, January, 1868. New York, (W.A. Townsend & Adams) 
Ranking’ 8 Half- Yearly Abstract of the Medical Sciences, be 
Sable froni July to December, 1867. Philadelphia. (Henry 
Lea).—These semi-annual digests of the current medical literature 
eg 
ticles, the latter, two hundred and sixty ater presenting! in as sad 
compass, and for a small price, an abstract of the most =o 
papers published within a “es six months, in the various ne 
se of Ss medical scien 
exclusion of a wider reading of medical authors, may not 
cessfully resisted. 
3. Archives du Musée oe vol. I, Fascicule 1, 2, 3, ni 
1866, 1867, 1868. Roy. 8vo.—The Archives of the ‘Teyler ey 
are issued by the Dineen of the Teyler foundation, ays soe. 
age from time to time as memoirs may be ready for ad 
Solar Spectrum, by M. S. M. Van der Willigens Om ier = 
dispersion of fint glass, by the same; On the dete! ares of 
of the indices of refraction and on the dispersion ~ ret by 
sulphuric “as and water, by the same; On a ca of exp: of some 
illuminatin the same ; On the lines of “refraction ay the 
saline iclateoce qe os cot 
same; On the — of water, by the same. e se af ‘he 
a-sillé 
. The American Naturalist, Vol. Il, No. 5, detox © iA eel 
number. Salem, Mass, +The midsummer number of this Zool 
sy and Botany, w ich wi make it a very vsefil sine . coutails, 
