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324 Transactions of the Boyal Society of South Africa. 
Note. — The engorged nymphge were collected on March 30, 1910 ; they 
moulted into adults on April 21, 1910, and in their adult stage were used 
for the infestation of Heifers 1057 and 1058 {vide Experiment No. 1 " C," 
Nos. 25 and 26), on August 5, 1910, in order to test their infectivity. 
11. Heifer 836 rendered immune by inoculation (vide above). 
Infested on March 24, 1910, with brown nymphge off Calf 700 (Eef. 
No. 309). 
Note. — The engorged nymphte dropped on March 30, 1910, and 
moulted into adults on April 21, 1910 ; the adults were placed on Heifers 
1057 and 1058 on August 5, 1910, in order to test their infectivity {vide 
Experiment No. 1 " C," Nos. 25 and 26). 
12. Heifer 895 was rendered immune by inoculation {vide above). 
Infested on March 24, 1910, with brown nymphge off Calf 700 (Eef. 
No. 309). 
Note. — The engorged nymphae dropped on March 30, 1910, and 
moulted into adults on April 21, 1910 ; they were placed on Heifers 1057 
and 1058 on August 5, 1910, in order to test their infectivity {vide Experi- 
ment No. 1 " C," Nos. 25 and 26). 
13. Ox 1047 rendered immune by inoculation [vide above). 
Infested on July 28, 1910, with brown nymphse off Cattle 700, 923, and 
917 (Eef. Nos. 309, 268, and 335). 
Note. — The engorged nymphae were collected on August 2, 1910, and 
moulted into adults on September 19, 1910 ; the adults were used for the 
infestation of Heifer 1088 and Calf 1145 {vide Experiment No. 1 " C," 
Nos. 25 and 26) in order to test their infectivity. 
14. Cow 1033 was rendered immune by inoculation {vide above). 
Infested on July 27, 1910, with brown nymphae off Cattle 700, 923, 
and 917 (Eef. Nos. 309, 268, and 335). 
Note. — The engorged nymphae were collected on August 2, 1910, and 
moulted int6 adults on September 19, 1910 ; later they were placed on 
Cattle 1088 and 1145 (vide Experiment No. 1 " C," Nos. 25 and 26) in 
order to test their infectivity. 
15. Heifer 871 was rendered immune by inoculation {vide above). 
Infested on June 28, 1910, with brown nymphae off Qattle 700, 923, 
and 917 (Eef. Nos. 309, 268, and 335). 
Note. — The engorged nymphae were collected and moulted into adults 
in due time ; later they were used for the infestation of Cattle 1088 and 
