100 
J. W. CONNAWAY. 
FIG. I.—YOUNG FEVER TICKS—“ BOOPHIRUS 
BOVIS,”—AND EGGS—HIGHRY MAGNIFIED. 
These observations led to the experiments to test the prac¬ 
ticability of immunizing cattle on northern stock farms by tick- 
infestation. This]work was begun in 1897, an d has been con¬ 
tinued to the present. 
The following animals were used in the experiments : In 
1897, 
No. 1.— u Jersey,” a yearling Jersey steer.* 
No. 2.—“ Spot,” a yearling Jersey steer. 
No. 3.— lt Red,” a yearling Jersey steer. 
No. 4.— u Fawn,” Jersey steer, 10 months old. 
No. 5.—“ Durham,” Shorthorn steer, 14 months old. 
No. 6.—“ Estes,” grade Shorthorn bull, 2 months old. 
No. 7.—Jersey bull calf, 6 weeks old. 
No. 8.—Jersey bull calf, 5 weeks old. 
No. 9.—Jersey bull calf, 3 weeks old. 
No. 10.—Jersey bull calf, 3 weeks old. 
No. 11.—Jersey bull calf, 3 weeks old. 
No. 12.—Jersey bull calf, 2 weeks old. 
* Nos. 1, 2 and 3 were also used in the “ Serum Experiments.” 
