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Chemistry and Physics. 235 
silvey, copper, mercury and bismuth. These metals form nitrite, 
nitrate and wate 
yt 
from oxygen (hydroxyl) in seoareous witHo's cid, and not ot hy- 
orm ammonia and generally sis see em do not produce 
nitrous acid or nitrite with free nitric the other hand 
they readily form abit by acting on ‘their own nitrate. Two 
. actions are noted: Ist, upon seven molecules of acid separating 
as hydr nee the poten ogen of six of them by forming 
eavin nv 
same as that existing in nitrates — —, these being its metal- 
a compounds.— 
4. On 
posed when exposed to sunlight into amorphous phosphorus and 
ee: oxide, Cowrer and Lewxs ha e 
men = view to verif them. eg obtained a perfectly 
n to ye filled wae 
ie a. and on shakin S gotion.in alg the air it at once 
ook fire. Aik ier portion of the white deposit treated with 
pute, = filtered left a residue of phosphorus on the filter which 
took fire on drying. On peice ep is the white deposit proved to be 
a piscine of phos osph oric oxide ma eget bese 9°6 and 
phosphorus Gy difference) 19°83 ent. The so-called phos- 
phorous oxide of Irving is therefore rcamunlnls pcebiions oxide 
aoe considerable free phosphorus.—/J. Chem sae xlv, 10, 
are 1884 Pom aa 
On the Constitution of Benzene. —About coca years pound 
acta sadn the hypothesis that all aromatic 
had as a nucleus six tetrad carbon atoms united in <i ‘eae 
ring. The marvelous fruitfulness of this hypothesis has well ni 
re-created organic chemistry. In 1879, Gruber produced an aoe 
by treating protocatechnie acid with nitrous acid, which he called 
carboxytartronic acid, to which he assigned the formula C,H, On 
