MERCUEIC, STANNIC, AND PLUMBIC ETHYLS. 
433 
Pig. 1 — Apparatus for distilKng Plumbic Dietbyl, &c. 
A. A wide-mouthed bottle. 
B. A well-ground stopper formed from a piece of stout glass tube, 2 inches in diameter. The stoppei- is 
gronnd rather taper to prevent adhesion. 
C. A small qnilled condenser. 
D. Tube connected by caoutchouc with mercurial gauge. 
G. Mercurial gauge. 
E. Air-pump. 
The tubes C and D are cemented into the stopper B by plaster of Paris and a layer of resinous cement 
to close the pores. 
E. Small receiver capable of being changed when needful. 
Pig. 2. — Modification of Dr. Peaneland’s apparatus for preventing loss by frothing when ma.king zinc-ethyl. 
1. Wrought-iron head screwed into upper plate of digester 2 ; 3, 4 screws vrith nuts and leaden washers 
for closing apparatus during the formation of zincethyl. 
When distillation is to be performed, the screw 4 is removed and the delivery tube 5 attached. 3 is then 
partly unscrewed ; and if frothing takes place, it passes through 5 into the retort without loss. 
