42 THE ROCKY MOUNTAIN SPOTTED FEVER TICK. 
provide such legislation as will make it possible to enforce the treat- 
ment of all the animals. 
(3) The obtaining of an accurate census of the horses, cattle, 
sheep, mules, and dogs in the valley. 
(4) The construction of 10 or more dipping vats. 
(5) The providing of materials to be used in the dipping mixture. 
(6) The organization of a corps of workers to carry on the 
operations. 
(7) The systematic dipping of the horses, cattle, sheep, and dogs 
of the valley on a definite schedule. The time of beginning and of 
discontinuing this work will depend somewhat upon the seasons, but 
should be about as indicated below. Weekly dippings are necessary, 
because, as pointed out in the discussion of the life history of the 
tick, adults may attach to domestic animals, engorge, and drop to 
the ground in a minimum of eight days: 
March 10. 
March 17. 
March 24. 
March 31. (Vat refilled on this date.) 
April 7. 
April 14. 
April 21. (Vat refilled on this date.) 
April 28. 
May 5. 
May 12. 
May 19. (Vat refilled on this date.) 
May 26. 
June 2. 
June 9. 
(8) The treatment by hand of the animals in localities remote 
from vats should be undertaken on this same schedule. 
One season’s work would certainly result in a very large reduc- 
tion in the number of fever ticks present in the valley. The second 
season’s operations would bring about still further reduction in num- 
bers, if not practical eradication. Nevertheless, a third season’s 
work is required to make certain of the results. 
ESTIMATED EXPENSES OF PRACTICAL ERADICATION OF SPOTTED-FEVER TICK 
IN THE BITTER ROOT VALLEY, MONT., NOT INCLUDING THE COST OF 
EXPERT SUPERVISION AND NECESSARY INVESTIGATION. 
The approximate cost of the work for the three seasons is indi- 
cated in the statement given herewith, which does not, however, 
include the cost of such expert supervision and additional investiga- 
tion as are required. 
