420 Correspondence of J. Nicklés. 
been solved by Dr. Fonssagrive, physician of the naval school at Brest, 
with the codperation of Messrs. Rubmkorff and DuMoncel. The appa — 
ratus consists of an empty tube of Geissler, of very small diameter fi 
Pho 
just speaking calls to mind some observations upon 
which have just been made by Phipson; he has found that like cane 
sugar, the sugar of milk or lactine becomes luminous by concussion, aud 
also by fracture. To evolve phosphorescence from the nitrate of uranium, 
it is sufficient to shake briskly a bottle containing a certain quantity of 
this salt in the crystalline state. The light is very vivid when the exper 
ment is made with one or two kilograms of this substance. 
poss 
5 
5 
=, 
as 
8 
SS 
> 
ry 
> 
oO 
2. 
al 
ct 
an) 
(97) 
i=] 
co 
a 
» 
3 
Qu 
> 
oy 
< 
2, 
i=} 
5 
Collie’ 
2 
“g 
= 
"3. 
es 
” 
r ‘ a eae Be 
The sixteen triangles are here given which Messrs. Biot and Arago fe 
determined in the prolongation of the meridian of France to the island 
tera. <A i 
Arago in the year 1853, the very year of his death, communicatel® 
the Academy a memoir upon the figure and physical constitution of 10 
which is likewise contained in this volume, and is accompane vier 
than 3000 micrometrical measurements of the diameters of Mars, /0PT™ 
science as well as to one of its most noble representatives. 
Bibliography.—The following works have just appeared at Paris. _, 
' Ocuores d. Arago, Tom, xvi, 1859; chez Gide, 5 rue Bonaparte.— This ¥ 
devoted to scientific notices bearing upon the personal labors of Arage, ™ 
