150 Scientific Intelligence. 
or barium platonitrite, Nirson has obtained a new class of bodies 
which he calls platoiodnitrites. e mixture, which is at first 
dark reddish brown, becomes, on heating to 30° to 40°, clear 
amber-yellow, evolving abundance of gas, in which the char- 
acteristic odor of aldehyde is perceivable, and depositing on 
cooling the platoiodnitrite in crystals. The potassium salt forms 
large brilliant four-sided amber-yellow prisms, having the formula 
eee .(H,O),. Nilson assigns to it the rational formula 
---Q---NO=:= 
eS the relation of this body to the pla- 
K---O---NO=:=I—~ 
K---O---NO=:=N0O---OW 
tonitrite ">Pt being very simple. 
K---O---NO=:=NO---O— 
The reaction he represents thus :— 
ee eons deb 
5 2 = 
The radical he names plato-diiodo-dinitrosy]. “en 
- Nilson has described also a new platonitrosylic acid, obtaine 
while endeavoring to produce platotetranitrosylic acid by the 
method of Lang. For this purpose barium platonitrite was de- 
composed by sulphuric acid in the cold, an 
evaporated in a vacuum over sulphuric acid. At first red needles 
were deposited, corresponding to the acid of Lang; but on carry- 
ing the solution to dryness, a brownish-green brilliant residue 
remained, which was easily soluble in water, was strongly acid, 
was permanent at 100°, and which after drying over sulphuric 
acid, had the composition H,(NO,),Pt,0.(H,O),. Hence the 
unstable tetra acid, evolving one-third its nitrogen as nitrous acid, 
orms a remarkably permanent octo acid, the potassium salt of 
which is well crystallized. The author calls it triplato-octon!- 
trosylic acid and assigns to it the rational formula :— 
~— — — = ee ed 
H---0---NO---NO---O._ 
Ae 
| >Pt - 0+(H,0).- 
H---O---NO---NO---O0— 
| l - 
i i 4 
H---O---NO---NO---O---Pt 
— Ber, Berl. Chem. Ges., x, 930, 934, May, 1877. G. F. B. 
4. On the Action of Bromine upon Pyrotartaric Acid.—Bovk 
coin has studied the action of bromine upon pyrotartarie acid, 
prepared as usual by the distillation of tartaric acid. For this 
purpose 6°5 grams were heated with 10 ¢.c. of bromine and 50 ¢.c. 
r 
to 152° for fifteen hours. On opening the tubes carbon dioxide 
was abundantly evolved, and the tube contained a dense liguid 
upon which rested an aqueous solution of hydrobromic acid. The 
heavy liquid, after washing with dilute potassium hydrate solution, 
was colorless and transparent, having an ethereal camphor-like odor, 
