64 Scientific Intelligence. 
WO; .WO;.90Na,, and 20Mo0; . MoO, . 90Naz. 
They will = fall naturally into the 20-atom series. It seems 
also possible that the curious salt of Wohler wag written 
WO,Na,+W,0, may be represented by such a formula as 
i6WO, .4WO 1ONa, or W2,.W.0,,(ONa),,;.- T shall de- 
vote myself to these compounds until I have exhausted the sub- 
ject as far as possible, and meantime anticipate many new results, 
SCIENTIFIC INTELLIGENCE. 
J. CHEMISTRY AND PHysiIcs. 
On the Effect of Pressure on Chemical action 
one attention to Quincke’s statement that in some Sexpaineitle 
e made in which sulphuric acid and zine were placed in 
contact, the pressure of the evolved hydrogen rose in a few days” 
from i4 to 10 atmospheres (varying with the apparatus), in five 
months from 27 to 54 atmospheres, and in 17 years, from 25 to 
126 atmospheres, and remarks that these experiments, made for 
an entirely different purpose, ee prove that the evolution 
of hydrogen is not arrested by pressure, but is only diminished in 
rapidity, confirming his results of acne — ago. in this case, 
chemism is not modified, but only the nature and extent of the 
surface of attack, the metal becoming covered with an adherent 
oe: layer, while the acid close to it becomes cara 
Hence, in his opinion, the evolution of hydrogen would 
indefinitely, limited in time only by the strength of the von 
reine the reagents.— Bull. Soc. Ch, U, xxvii, i ae 
1 
is obtained by means of the formula oni (c, —6, —ce+ 9) m 
which 4 and &,, ¢ and ¢, represent the first and second weighings 
with chlorine and carbon dioxide respectively. This weight 
