418 Scientific Intelligence. 
closer proximity, which such a concentration would cause, 
(5.) That when the substances are very diamagnetic the disper- 
sion of the rays caused by the magnetic rotation is sensibly pro- 
n? (n?—1) . 
2 
portional to in which expression A is the wave length 
and n the index of refraction. For various qualifications and 
details we agit refer to the original paper, and also for a discus- 
sion of the theory scscapstebe by M. Becquerel pére, which refers 
the digerencee between magnetic and diamagnetic effects to the 
relative strengt of ‘ahs magnetic energy of the bodies experi- 
mented on and — of the ain um ad which they are o_o 
nepee Chim. et de Phys., 
 eaeiees Siete of ie —The nadine of the 
“hitches of the rose-colored sulphide of manganese obtained 
pall Apinseniaes into the green semi-crystalline modification of the 
mpound has been studied by MM. Ph. de Clermont et 
H, aise who come to the conclusion that the two substances 
are different <tget - sic of the same body.—Ann. Chim. 
et de Phys., V, x 
16. An nalysis of ‘Alkaline Sulphides and Sulpho-carbonates.— 
M.M. Detacuanat et Mermer have described a new method for 
the complete chemical analysis of alkaline sulphides and sulpho- 
carbonates based on the application of hypobromite of potassium 
as an oxidizing agent. e method offers certain mar rked advan- 
aris and ‘Gmolived the process prop rallas for 
separating potassium from sodium based on the pianigiaiioes that 
potassic —. rate is insoluble - alcohol and the 
LAUIVGE 
uently 
is the only one whose prochlorat e gids not dissolve in this 
as perchlorate after the salt has been teal to ae while the 
sodium is converted into sulphate and weighed as reo —Ann. 
Chim. et de Phys., V, xi, 561. Je Py 0.5 oR. 
= ar Ray ener. athod of determining i amount of Man- 
gan s described by M. Garcta ParreXo which 
will “andoubtedly 1 ue found useful in many shea The manganese 
acid. The process is conducted in a flas the chlorine gas 
conducted into a weak solution of potassic ‘odide, the last traces 
being driven over by boiling the acid. The amount of iodine 
