264 DR. E. frankland’s researches on organo-metallic bodies. 
about 60° C., but the thermometer gradually rises until about three-fourths have 
passed over, when it becomes stationary at 118° C, The receiver must now be 
changed, the retort being- first allowed to become quite cold. On the subsequent 
application of heat, the whole of the remaining- liquid distils over at 118° C. This is 
pure ziucethyl, and maybe received in a peculiarly constructed vessel, from which it 
can be conveniently expelled in small quantities as required. 
This vessel, which is a kind of syringe glass, is repre- 
sented by fig. 5. A, A is a tail glass cylinder with a slightly 
contracted mouth, well fitted with a sound and thoroughly 
dry cork coated with gutta percha varnish. Through this 
cork pass three tubes: one a, terminates just below the c 
cork and projects about 2 inches above the mouth of the 
cylinder; it is about a quarter of an inch internal dia- 
meter, and serves to receive the drawn-out beak of the 
retort g (fig. 4) during the distillation of the pure zincethyl : 
when the distillation is completed, a is closed by a cork 
covered with sealing-wax. Another tube, h, one-sixteenth of an inch bore, passes to 
the bottom of A ; it is bent above at an acute angle, and, after passing through a small 
cork d, terminates at c in a capillary orifice. The cork d serves to close another 
small tube, e, which encases h, and protects its capillary orifice from the atmosphere. 
The third tube,/*, connects the upper part of A, A with a chloride of calcium tube 
g, g, to the opposite extremity of which the thin caoutchouc globe h is attached. 
By removing the tubular cap e and pressing h, which is previously filled with 
carbonic acid, it is thus easy to transfer any required quantity of the liquid in A to 
any other vessel. 
To determine the composition of zincethyl, a quantity was transferred into a small 
glass bulb with a very narrow mouth, previously filled with dry carbonic acid. A 
number of smaller glass bulbs, capable of containing about 5 decigrammes of the liquid 
and having long capillary tubes attached, were then filled with carbonic acid by 
being repeatedly heated and cooled in an atmosphere of this gas ; these bulbs were 
then paitially filled in the usual manner with zincethyl from the larger bulb above 
mentioned, and the increase of weight being noted, they served for the following 
quantitative determinations : — 
I. •2578gi-m., burnt with oxide of copper and oxygen, gave *3653 grm. carbonic 
acid and "1915 grm. water. 
II. *2443 grm., similarly treated, gave *3495 grm. carbonic acid and *1799 grm. 
water. 
III. *3139 grm., slowly decomposed in a graduated tube filled with slightly acidu- 
lated water, gave *2045 grm. oxide of zinc and *1459 grm. hydride of ethyl, as deduced 
from the annexed observations: — 
