EXPERIMENTS IN MOUNTING THE AMPHIPLEURA PELLUCIDA. 129 
is applied in the same way as with chloride of tin; resublime and 
mount as before, salt deliquescent, striz well defined, but not so 
pretty as with the tin and lead salts. 
On subliming the chloride of antimony with metallic arsenic on 
to a prepared cover-glass, and then subjecting the cover-glass to 
chlorine gas, the diatoms are gradually dissolved, ee only 
the central rib left, with the remnants of a fringe_like process pro- 
jecting from the rib. It matters not how little of the diatom i is 
left, the striz are still visible. This will explode the theory that 
because no strie can be obtained on some old A. pellucida 
mounts they (the striz) must be dissolved or eaten away. 
Chloride of copper.—The copper chloride deposit is not so 
volatile when resublimed as the former ones, consequently it is 
liable to leave a dirty deposit on the valves, although the striz are 
well defined. 
Chloride of sulphur.—tThis is a reddish-yellow liquid, giving off 
fumes on exposure to the atmosphere. It is only necessary to 
take the stopper out and place the prepared cover-glass over the 
mouth of the vial ; in one minute’s time a sufficiency is deposited 
goo e h 
mounts in fact it is a sulphur mount imbedded in the piperine. 
Chloride of xinc.—Prepared and mounted in ihe same wa 
e former salts, very deliquescent, not so good as the tin, lead, or 
antimony, but better than the biniodide of mercur 'y. 
Chloride of arsenic is made by depositing the metallic arsenic 
on to the cover-glass and then subjecting the deposited arsenic to 
the action of nascent chlorine, generated from common salt an 
sulphuric acid in a small vial, the a being placed on the 
— os vial. The striz are well define 
Iodide of arsenic.—As this salt is very impure, T dissolved it 
in bietiihido of carbon. Filter and keep in a stoppered bottle. 
Allow a few dr ops of the solution to evaporate on a glass or mica 
slip. The glass is the safest, as if any of the solution gets between 
the mica scales and remains nar igr weet when in an unconscious 
operator may get, before he is aware of it, more arsenic than he 
bargained for. On Tolling the slip over the flame of a spirit ee 
fumes are given off and deposited on the cover-glass, as 
