3 
» DIRECTIONS FOR USE. 
Much experience indicates that in order to destroy the household 
insects mentioned, 1 fluid ounce of commercial sulphuric acid (about 
1.84 Baumé) diluted with 2 fluid ounces of water, to increase the bulk 
of the liquid and insure complete chemical action, and 1 ounce of high- 
grade (98 per cent) cyanide of potassium, must be used for every 100 
cubic feet of space. The formula per hundred cubic feet, therefore, is 
as follows: 
Potassium cyanide (98 per cent) _______ avoirdupois ounce__ 1 
Commercial sulphuric acid_-.._____.____....=_- fluid ounce__ 1 
Waite eee eee eo ee ech fluid ounces__ 2 
For loosely constructed frame houses the above amounts may be 
doubled per hundred cubic feet. The cyanide costs about 40 cents a 
pound and the sulphuric acid (thick or more siruapy commercial brand) 
about 4 cents a pound. 
Before performing the operation the house must be vacated. It is 
not necessary to remove any of the furniture or household belongings 
unless of polished nickel or brass, which may tarnish a little. Liquid 
or moist foods, as milk, meats, or other larder supplies that are not dry 
and might absorb the gas, should be removed from the house. All 
fires should be put out; for while the gas will not burn under ordinary 
conditions, it is as well to take no risks. 
The cubic contents of each room on each floor should be carefully 
computed and a tabular statement, such as that given below, prepared, 
designating for each floor and the different rooms the capacity and the 
amount of water, acid, and cyanide needed. 
Table designating rooms, capacity, and amounts of chemicals. 
1 ; 
Floor. Room. Cubic feet. | Water. | Acid. Cyanide. 
| Fl. oz | Fl. oz. Avd. 0z 
EL aU; bn Se dS Garreteeeees eee ae 87,000 | 140 70 70 
NIG ee as LDR oe Re ee 2,800 || 56 | 28 28 
Middlers= see 2 1,400 28 14 14 
SC Kawa eee et | 2,200 44 22 22 
CCUM Cie eee ener oe Ys HIROMI 2 anaes ot 45,500 110 55 55 
1 (YoU yen ee eee wee ee | 2,200 44 22 22 
| Ia oltc LSS ee ee 2,000 410 20 20 
INS he ae ee | Leah oye — 3s aoe eee 44,400 88 44 44 
leMiddley eases sss 2s S| 2,400 | 48 24 24 
Dimin cise ae 2,900 | 58 29 29 
Basement._.-..-...¢__.... Seryant’s -___..__.__. 1,200 | 24 12 12 
1 aU A 28 en ee ne 2,000 40 20 20 
WRitchen s.eke8 lie 1,800 | 36 18 18 
MOG sane neee on el le A 37,800 | 756 378 378 
©The charges for these rooms should be halved and set off in two vessels. 
The house is prepared for treatment by seeing that all the windows 
are closed, and calked, if necessary, with moist paper or rags, and that 
