96 
Ticl; Parali/sis 
at'tei' the Hock when approached. After a short time the animals no 
longer rise on being approached ; if they are lifted up they walk 
unsteadily and soon lie down again. The sheep may be completely 
paralyzed within six hours after the onset of symptoms, and they appear 
as if asleep for 24-48 hours; recovery follows rapidly in most cases. 
Very few animals die if they are left undisturbed in a shed, but 
deaths are fairly common in the open, for the prostrate sheep fall 
victims to marauding jackals. The affected sheep show no febrile 
reaction. 
Aiitopsy. No noticeable lesions were observed. 
Inoculation exjoe^'iments gave negative results. Veterinary Surgeon 
Spreull failed twice to transmit the affection from paralysis sheep to 
healthy sheep by blood inoculation. 
Ticks and their hearing on the affection. The ticks, Ixodes pilosus, 
were found both on healthy and affected animals. “The number of 
ticks does not seem to inHuence the severity of the case, two ticks 
inducing as bad a case as fifteen; but if the ticks are removed 
immediately the sheep is observed to be sick, the recovery is more 
rapid, within 12 hours, in many cases, recovery is complete.” 
/. jnlosus attaches itself to the host mainly inside the thighs, 
behind the elbows and between the lower jaws. 
Effect of Dipping. The use of Cooper’s Dip was found to be 
effective. Of 88 sheep grazed in a kloof where the disease prevailed, 
68 were dipped and 20 were not dipped. During three weeks no 
cases of tick paralysis occurred among the 68 dipped animals; whilst 
6 cases (3 fatal) occurred among the 20 undipped sheep. Moreover, 
at Hartmanskraal, in the mouth of June, where 60-70 cases occurred, 
the trouble ceased on two occasions when dipping was resorted to. 
Tick Paralysis in Man in Oregon. 
The following extract is from the interesting paper by Temple 
(IX. 1912, pp. 508-514) with but slight alterations in the numbering of 
the cases consecutively, typographical corrections and a word or two 
added in [ ] brackets. Dr Temple writes;— 
“ The following cases have come under my observation while practis- 
insf in Wallowa and Umatilla counties. Oregon : 
Case 1. Little girl, Thompson, of Wallowa, Oregon. Age five, 
retired at bed-time in her usual normal health ; all her life she had 
been in perfect health. Upon rising the following morning she was 
