METHODS OF DESTROYING TICKS. 43 
First year: 
10 vats, costing $200 each £ 
Each vat to have a capacity of 2,000 gallons. 
Cost of filling vats four times during season, at $0.0031 per gallon. 1 . IMS 
Salary of one superintendent, 12 months 1 . 800 
Salaries of 10 assistants for 5 months, at $80 each 4,000 
The period to be covered by these men extends from Feb. 15 to 
July 15. 
Incidentals 1. 000 
Total, first year 9,048 
Second year : 
Repairs to vats 200 
Cost of filling vats four times during season 24S 
Salary of one superintendent 
Salaries of 10 assistants 4,000 
Incidentals 1, 000 
Total, second year 7.24^ 
Third year : 
Repairs to vats 
Cost of filling vats four times 248 
Salary of one superintendent 1,800 
Salaries of 10 assistants 4,000 
Incidentals 1. 000 
Total, third year 7. 34s 
Grand total 23 
It may be found that more than 10 vats will be required. In that 
case the output for materials would be increased somewhat. 
After three seasons' operations a very small annual expenditure 
will be necessary to avoid reinfestation of the valley by the incom- 
ing of cattle from other places. This could be easily accomplished 
by employing an inspector at a -alary of. say. $100 per month for 
six months* service each year. 
SUPPLEMENTARY MEANS OF CONTROL. 
The main reliance in work of controlling the spotted-fever tick 
must be placed upon the clipping and hand treatment of domestic 
animals. However, there are certain supplementary mean- of con- 
trol which should be practiced. These are (1) the reduction in the 
number of rodents in the valley and (2) the clearing of the brush 
land along the edges of the valley. 
As has been explained in this bulletin, the destruction of the ro- 
dents is not a vital part o{ the plan of eradication we propose. 
1 Th»> cob! of dip per gallon is computed as follows: Arsenate triozlde, 5] cents per 
pound: sodium carbonate, 2 cents per pound; tar. 33] cents per gallon. 
