METHODS OF DESTROYING TICKS. 43 
First year: 
DO vats; costing $200neaqh 44: eee ee $2, 000 
Each vat to have a capacity of 2,000 gallons. 
Cost of filling vats four times during season, at $0.0031 per gallon.*t_ 248 
Salary of one superintendent, 22 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. 
[ater a Kn il ho a Re oe Ree eS Pe Re eee POE Ros 1, 000 
TROVE 9-4 CHS) eipeh 72k ea pa een a Ep ame care See OO SA PAN ee = 9, O48 
Second year: 
LES 2 UES HUES he Weg 3S apa el ea Ap a Se le Oe IS ply he ad 200 
Cost of-fillmg vats'four ‘times during season______________-_________ 248 
SHHaiyOL (One ssi perin tantent ais tees Oe yey Peay th egg 1, 800 
Sadaries| [o6]4'O fa ssishants 2-45 - See eg Sed ee a 4, 000 
Do S318 PE8 a2 AS eu I cna aL a le OE ce ee = ae ee oe 1, 000 
BIACp et re SECO Cen V eu eters Sen Ree cee a ee ee = 2 ee 7, 248 
Third year: 
PIMESTOELM TES PEO ORNS ee ee FES Peale ed yk ee St yal ee Ney 300 
COS Ola tat? Weck UT Tmt LISS es a 248 
Salve OMe SS penen tENGON ts. 2 se a ate ee Ee 1, 800 
SULT TRE Sb hd KORE SFG UST 2S oe I SE ads ee es eee 4, 000 
SUUVETKo ese UR Sie Ss eo EEL ee oe SL i ed ee a 1, 000 
ANG EM War TROD | ete lee es Coe eat ow Sa oh oy eee ue es ree Pee eee Sane es 2 eer 7, 348 
(Grate naVe lye ss) Psi Ie ye RT eRe exc erie Oa eo. Eo en ae ce eer, ere 23, 692 
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 salary 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 dipping and hand treatment of domestic 
animals. However, there are certain supplementary means 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 of the plan of eradication we propose. 
1The cost of dip per gallon is computed as follows: Arsenate trioxide, 54 cents per 
pound ; sodium carbonate, 2 cents per pound; tar, 334 cents per gallon. 
