84 
is released the paper will descend with the cyanide and remain at rest 
on the top of the jar but will not prevent the easy descent of the cya- 
nide into the acid. The weight of this paper will in no way interfere 
with the eseape of the gas. 
At the end of the time required for fumigation the windows and 
doors should be opened from the outside and the gas allowed to escape 
before anyone entersthe building. A general cleaning should follow, 
as the insects leave their hiding places and, dying on the floors, are 
easily swept up and burned. The sulphate of potash remaining in 
the jars is poisonous and should be immediately buried and the jars 
themselves filled with earth or ashes. No food that has remained 
during fumigation should be used, and thorough ventilation should 
be maintained for several hours. After one of our experiments it 
was noted that ice water which had remained ina closed cooler had 
taken up the gas and had both the odor and taste of cyanide. 
For dwellings one fumigation each year would be sufficient, but for 
storage houses it may be necessary to make an application every three 
or four months to keep them entirely free from insect pests. The 
cost of materials for one application is about 50 cents for each 5,000 
cubic feet of space to be treated. The cyanide of potassium can be 
purchased at about 35 cents per pound and the commercial sulphurie 
acid at about 4 cents per pound. The strength of the dose may be 
increased and the time of exposure somewhat shortened, but this 
increases the cost and does not do the work so thoroughly. In no ease, 
however, should the dose exceed 0.22 gram, or remain less than one 
hour. 
The practical application of this method of controlling household 
insects and pests generally is to be found in checking the advance of 
great numbers of some particular insect, or in eradicating them where 
they have become thoroughly established. This method will be found 
very advantageous in clearing old buildings and ships of cockroaches. 
INSECTS OF THE YEAR IN OHIO. 
By F. M. WEBSTER and WILMON NEWELL, Wooster, Ohio. 
Broadly speaking, the past year has been marked by the unusual 
abundance of many of the more common insect pests. 
During the past spring and early summer the chinch bug has done 
serious injury over the area which seems particularly favorable to 
it, viz, the country lying between the Scioto and Big Miami rivers, 
which section is, approximately, the most frequently and seriously 
affected by it. As in other years, Sporotrichum globuliferum, the 
fungus enemy of the insect, has been distributed to all that have 
applied, and the packages thus distributed amount to about 1,700 in 
number. As this fungus has been continually sent into this region 
since 1894, we can now state, with pretty good assurance of correct- 
ness, that the artificial introduction throughout this period has given 
