Transmission of East Coast Fever by Ticks. 
331 
Be-infested on September 15, 1910, with 20 brown nymphae (Eef. 
No. 364). 20 ticks were fast on September 16, 1910. No reaction^ 
ensued. 
Re-infested on September 30, 1910, with brown nymphse (Eef. 
Nos. 355 and 356. 10 ticks were found fast the following day. No' 
reaction followed. 
Be-infested on October 20, 1910, by the infestation of 6 brown adults, 
origin Natal (Eef. No. 349). Heifer 1014 contracted East Coast Fever 
and died on November 21, 1910. 
4. Cow 1068 had been previously used in connection with the artificial 
transmission of East Coast Fever, with negative results. 
hifested on August 17, 1910, with brown nymphae (Eef. No. 363). 
On the following day about 70 were found fast. The engorged nymphae 
were collected on August 23, 1910. No reaction ensued. 
Be-infested on September 15, 1910, with brown nymphae (Eef. 
No. 364). 20 ticks were found attached the following day. No reaction 
resulted. 
Be-infested on September 30, 1910, with brown nymphae (Eef. 
Nos. 355 and 356). 14 ticks were fast the next day. No reaction. 
Be-infested on October 20, 1910, with 6 brown adults, origin Natal 
(Eef. No. 349). 5 adults were fast the next day. This cow contracted 
East Coast Fever and died on November 21, 1910. 
ip) Brown nymphs (Eef. Nos. 363 and 373). 
5. Ox 1037 had been previously used for the artificial transmission of 
East Coast Fever, but with negative results. 
Infested on September 5, 1910, with brown nymphse (Eef. No. 319). 
27 ticks were found to be attached the following day. No reaction 
ensued, 
Be-infested on January 30, 1911, with 20 brown nymphae off 
Heifer 909 (Eef. No. 373). 20 ticks were found fast the following day. 
Ox 1037 contracted East Coast Fever and died on February 22, 1911. 
(c) Brown nymphj^ (Eef. Nos. 363, 364, and 349). 
6. Ox 1046 had been previously used for the artificial transmission of 
East Coast Fever, but with negative results. 
Infested on September 5, 1910, with brown nymphae (Eef. No. 319).. 
28 ticks were found attached the following day. No reaction developed. 
Be-infested on October 20, 1910, with 10 brown nymphae (Eef. 
No. 364). On the following day 8 ticks were found fast. No reaction 
followed. 
