116 Scientific Intelligence. 
Les Abeilles et 0 Apiculture, par M. de Frariére. 1 vol. in 12mo. Paris: 
Hachette.—The author is a great lover of bees. He has made them the sub 
ject of much study, and gives in this work the results of his useful labors. 
Compositions de Mathematique et de Physique, par M. Jouve. 1 vol. 
in 8vo. Paris: Hachette-—This work contains a large number of prob- 
lems in Physics and Mathematics, intended for the education of the young 
who have science, commerce or the arts in view. It is highly appreciated 
by masters and students, connected with the educativnal institutions of 
Paris, and France generally. 
SCIENTIFIC INTELLIGENCE. 
I, CHEMISTRY AND PHYSICS. 
1. On the wave length of the most refrungible rays and of those which 
t chemically upon iodid of silver —Etsex.tonre has communicated some | 
interesting additional facts with respect to the diffraction of the more re 
frangible rays of light. The author’s earlier results have already been 
mentioned in this Journal: those now communicated were obtained by 
Ss impressions of diffraction spectra taken upon a film of col- 
odium-iodid of silver placed at a distance of 5°58 metres from the ob- 
jective of the lattice. The author measured the distances from the mid- 
dle of the image of the slit to the borders of the different lateral spectra 
ape — determined the wave lengths of the corresponding rays by the 
ula 
u sme SIN YW, 
By a comparison of the wave lengths thus obtained it appears that we 
visi 
(in Pogg. Ann. vol. 97, p. 137) who projected prismatic spectra upon pho- 
tographic paper. It is certainly true for rays of sunlight acting upon iodid 
and H or the wave lengths 396 and 429 millionths of a millimetre. It 
diminishes a from 396 to 354, but rapidly from 429 to 433, which 
bably arises 
probab’ 
denoted by 7, mand n. The author further states, that from analogous 
experiments there appears to exist just as definite a limit for the thermic 
On Tantalum and its compounds with chlorine send bromine.— 
Rose has communicated an interesting memoir upon this most difficult 
subject to which he has devoted so much time and talent. The @ 
remarks that tantalum has hitherto been found with certainty only in tw? 
