Physics and Chemistry. 255 
5. A system of instruction in Quonsiiarine Chemical Analysis ; 
by Dr. C. R. Fresenius, from the last English and German edi- 
tions, seine by Prof. 8. 'W. Jounsoy of Yale Co ollege. 8vo, pp. 
York: (John Wiley & Son). 1870.—In explanation of 
the Satna made in this aged edition we quote the follow- 
ing from Prof. Johnson’s prefac 
“In preparing this edition of. Fresenius’ Quantitative Chemical 
Analysis, the editor has sought DE various changes to adapt it to 
the wants of the American student. 
The foreign editions have attained such encyclopedic dimensions 
a8 to occasion the beginner no little confusion and embarrassment, 
For this reason the bulk of the work has been considerably re- 
duced. A few processes which the editor’s Sas lence ie con- 
vinced him are untrustworthy, and many more that can well be 
veered because they are tedious or Gaaers, have feet omit- 
Plants has oe “left pec The re nt appearance of an peelent 
Special treatise on “ Agr eal ‘Chemical haalvea?! by Profes- 
sor agin ell, of Coeds gel justifies the last named omis- 
sion 
scribed in Sis own ables pee monde. ari wm 
estimation and separation are incorporated i 3: 1 their proper places. 
~ Sdditions which have been made to of examin- 
oy 
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the study of ana lytical chemistry in this country, a and that its 
publication will be welc omed by teachers and students of quan- 
titative chemical analys 
8. Effects of the cag Heat on a Sand Hill.—Extract from a let- 
ter of Gro. Davinson, Esq., of the Coast Survey, dated U. S. Coast 
Survey Station, San Buenaventura, Cal., mane’d , 1870, — 
margin that extends 300 yards to the sea beach. At the station, 
the triangulation from the station Bae songs er on pss: - 
eke gg ewpige from sunrise to 1 
and from 34P. 
lp.m. Imagine my surprise when I cen that the heat of the 
