164 Miscellaneous Intelligence. 
several very serious deficiencies. The present edition is much 
enlarged, and these —. iencies have been supplied. Some of the 
ceapedes are, from the increase of our knowledge, almost entirely 
new. The net caesar ad the volume is not less than 200 pages 
‘The work is, as its title implies, strictly descriptive. The author 
has in general eviiicd all theoretical discussions. The law of 
— gravitation and the nebular hypothesis ~~ alike omitted. 
‘he same is true of spherical astronomy and all methods of com- 
pu fiation except the v simplest. ‘The volume is therefore a 
handbook of the known facts of Astronomy, stated with the least 
possible amount of mathematics. Itis not designed or fitted to 
V. MISCELLANEOUS SCIENTIFIC INTELLIGENCE. 
. Abstract of a pamphlet entitled Reflections sur les Chron- 
phony par J. A. Rovyaux, Enseigne de Vaisseau. Translated 
by Lieut.-Com. C. H. Davis Nt 
art {—Contains an exposé o of numerous inconveniences in ns 
direct application of formule to chronometers at sea, and a resum 
of the advantages to be derived from an application of the ‘ent 
to os differences of rates observed daily at sea. 
t 11—Contains a demonstration of some properties of lines 
of sateen rates and temperatures (lignes isothermes et lignes 
isomarches). 
8 a necessary corollary follows an examination of the results 
Sears uring a cruise of thirty months, by the chronometers 
ib 
given oat view to make public a research biol: weld perhaps have little 
currency in this country, and without committing the translator to the views 
ich 
