'I'll i: MARKING 01 I IN IS. 
boy, Furnishing a son of rest when the latter is tipped to remove the 
acid. It is well to scoop out a small pit below this ridge of dirt, into 
which the vessel receiving the acid may be lowered when the acid is 
bo largely removed that it is necessary to turn the carboy far on its 
side in order that all may be withdrawn. 
In figure 19 the handles on the carboy are substitutes for the heap 
of dirt and the pit. They are also of service in carrying the carboy. 
Tin: PROTECTION OF 
(YAM I). 
Many fumigators do 
not attempt to cover 
their cases of cyanid, 
hut leave them open 
during the day. Tins 
not only constitutes a 
source of danger to 
various animals, but 
also during the wet 
season allows water to 
reach the cyanid. Fig- 
ure 20 shows a simple 
lid covered with zinc 
which is suitable for 
placing on a cyanid 
case to protect its con- 
tents. 
HYDROCYANIC-ACID 
GAS IX DRUMS. 
Some discussion has 
arisen during the past 
Year relative to the Fig. 18.— Carboy resting against a heap of dirt to facilitate pouring 
possibility of introduc- • " kL (0rigInal - 
ing hydrocyanic-acid gas into drums under pressure, and using it 
directly from tin 1 drums, thus doing away with all generation in the 
field. The use of this gas under pressure from drums is impossible 
at the present time for two reasons: (1) No drums are made which 
will hold hydrocyanic-acid gas without corroding; (2) we know of no 
instrument which will measure gas accurately under varying degrees 
of pressure, such as would exist in removing a gas underpressure from 
drums. 
THE MARKING <>l TENTS. 
Before new tents are marked they should have been m use for a 
-hort time, so that they will be thoroughly shrunken. This shrinking 
