When this occurs the flow of water through
the chamber is stopped by using the spring clothes-pin as a clip on the
upper tube. In order to regulate the thickness of the tissue to be cut
a scale is engraved on the edge of the revolving plate, A, which,
in conjunction with the pointer, e, indicates the thickness of the
section.--_Microscopical Journal_.
* * * * *
THE ST. GOTHARD TUNNEL.--It appears that the traffic through the
St. Gothard Tunnel has increased, since the inauguration of through
international services, to such an extent that the Company have already
obtained sanction for laying the second pair of rails in the tunnel. The
Great Eastern Railway Company has increased its steamer traffic, and
built additional station accommodation at Harwich.
* * * * *
VINCENT'S CHLORIDE OF METHYL ICE MACHINE.
Chloride of methyl was discovered in 1840 by Messrs. Dumas and Peligot,
who obtained it by treating methylic alcohol with a mixture of sea salt
and sulphuric acid. It is a gaseous product at ordinary temperature, but
when compressed and cooled, easily liquefies and produces a colorless,
neutral liquid which enters into ebullition at 237.
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