Miscellaneous Bibliography. 143 
are called molecules”; and again when chemical hragtg- is defined 
a that force which causes the elements to comb Moreover 
the equation Na,0+H,S0,—HNad80+HNasé, is iv hardly admis- 
sible. We think that the book will serve a good purpose neverthe- 
24 and commend it to the attention of teachers. 
The Cambridge course o Elementary Physics: Part Third, 
sitiehow, by W. J. Rotre and J. A. Gituerrt, Teachers in the 
High School, Cambridge, Masa. 308 pp. 12mo 0, with numerous 
ghana Mensa 1868. (Crosby & Ainsworth, Boston; O. 8. 
Felt, New Y rk.) —This little volume is intended as a popular in. 
troduction to Acerbis for High seo and ——— and 
appears to be well adapted to its - e ruse mathe- 
of iti of the planets, have hardly been axial as wood en 
. volume closes with “Questions for review and examination.” 
4, Akademische Denlvaien von Dr. Cart Fr. Pu. v. Martius, 
Mitglicde der K. Bayer. Akademie der Wissenschaften, und Secre- 
taer der Mathemat. Files. as00m Classe. Leipzig, 1866. pp. 619.— 
At various times, during many years past, Dr. Von Martius has 
been called upon "to prevent: ee the Academy above named, bio- 
graphical or memorial notices of members recently deceased, a 
" work he was peculiarly fitted to perform. He has now collecte 
the papers into the volume before us, sy a valuable collection 
of forty-four biographical notices, some which have appeare 
before, others not, but all have been ail or amended, where 
this has been deemed advisable. We have here pleasant sketches 
of the lives of many of the men who have been especially eminent 
in science in meee who have died during the last thirty years or 
more, 
might be with ¢ potripasbenkite views of the arran aieaemmeita of the 
earth’s surface, The author sees no objection to the Darwinian 
ecbiictdd of the Superintendent of the U.S. Coast Survey, 
showing he Progress of the Survey during the year 1865. 232 pp. 
4to, with 31 large plates, mostly maps.—The health of Dr. Bache, 
the perintendent of the Coast Survey was already much im- 
at when the Report for 1865 was called for, and the work of 
its preparation consequently devolved pest ue able Assistant in 
re, J. E. Hil This v 
