148 Scientific Intelligence. 
same chemists have now inteodaned into the chemical works at 
Palins and eae gases. On the large scale, retorts are- 
used like those employed in the palatal of gas, and the 
ammonia through Patatic alicali to absorb the 
hydrogen cyan The gases are collected ina Restol see and 
used for illumin To prepare the ferrocyanides, w 
tea ote of ferrous oxide is gos in the alkali- geese. ade 
3. On the Preparation of Marsh Gas.—Some 6a ears ee 
GLADSTONE and TRIBE ae out that by the reaction of the 
copper-zine couple upon methyl iodide in pee of water or 
alcohol, marsh gas was readily produced, as follow 
oe A+H,0+ZnCu sein, Stee SOR 
tube was fixed above the flask like an inverted condenser. After 
foaming the zine with dilute sulphuric acid, it was treated three 
times with a solution of copper welphate until all ake copper had 
fens. precipitated on the zine, and then well washed, first with 
water and then a aleohol. The apparatus was then put 
together and by means of a tap funnel ea into the flask 
20 c. ¢. of methyl iodide and the same volume of alcohol were 
allowed to run into the latter upon the ¢c SoppeE RING couple. 
reaction began at once, the first liter of marsh gas being col- 
lected in eight minutes. As a result 7500 c. ¢. of the gas was 
obtained, or 7053 ¢.c, reduced to normal temperature and pres 
sure, As the theoretical yield is only 7100 c . ¢, the bers gives 
basal a ne OP end the pyramid P, which was 118° 434’ 
faces observed on 8 furnished by Nilson and Petters 
were: «P, »P2, OP, P; and in addition, on the specimens roi 
nae 
dada eevee 
Pic cae 
eee eh RE 
Pitcairn Peas tir See ee 
aif, ae ae Nee ee aM Petro tle NEON TR re es eg eee ee ee ee 
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eee ee is i 3 ie 
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