260 Scientific Intelligence. 
partments of science, art, industry, literature, politics, and even war. This 
colossal work remains in the ‘state o ition’ beginning to 
the end, and therefore open to emendations, until the moment of 
tion. Supplements will be published as may be required. y 
tionary is so put together as to admit of modifications, which must 
merous; for the good faith of the author has been more nce 
lands haye a place in it; and the American reader will find a bio, 
cal notice of the principal men of the State, Art, Literature and Se 
in the United States. , — 
Les Philosophes Frangais au 19¢ siecle, par Tanz, in 12-de 368 pages. — 
—This work is written with much spirit, and in a style both elegant aud 
well adapted in our view for the scientific criticism it contains. : 
Desctoziires.— Vie et Inventions de Philippe de Girard, broch. m 
12mo, avec figures.—Philippe de Girard was the inventor of the machine 
for spinning linen thread, and the author of many other inventions, well 
exhibited and appreciated in this small work. 
SCIENTIFIC INTELLIGENCE. 
I, CHEMISTRY AND PHYSICS. 
: pec : 
aided by a lens of long focal distance, almost the whole portion om ye 
the blue rays fall appears blue. In this blue portion however, ano 
: : 
lated green fluorescent bands appear. The middle of one andl. 
corresponds to Frauenhofer’s line G; the two others lie between G 
The centres of these orrespond to the wave lengths 0 - 
~! s these wave 
0:000446mm, 0-00430mm, From this it appears that rays of these” 
lengths produce fluorescence, while those of intermediate ee ee 
: at that 
of in the 
at age temperatures, Arndtsen had arrived at the result ose 
simple metals, with the exception of iron, the resistance } par 
formly with the temperature and that in the different metals ere 
ative increase is nearly the same. Clausius remarks that 
numerical results may be expressed by the formula Pasig 8 
ae w, = w, (1-4 000366, ¢), an 
in which w, is the resistance at the temperature f, #, the resii#! 
