272 Scientific Intelligence. 
treatise terminates with a series of tables of coefficients of friction, re- 
sistances to n the whole the 
compression, tenacities, densities, &c. 
one of the most difficult but most beautiful and useful of the sciences. 
2. Darstellung der Farbenlehre und Optische Studien von H. W. 
ové.—Under this title Prof. Dové has published the second edition of 
an admirably clear and well written exposition of the theory of colors. 
The first edition of this work appeared in 1836, and has long been out 
of print. The author has now materially enlar 
e 
exclusively. Genera ics, however, are rarely SU rl 
ciently full and explicit in the details of the application of theories; = 
usually confine themselves in a great measure at least to phenomen™ 
gravitation—in short to be considered as the second great phy 
eralization to which the human mind has arrived. A com mp’ 
