Animal Diseases. 271 



Goat No. 327 was inoculated in the same manner with the blood 

 of Goat 312 on December 30th. and died on the 17th day of Heart- 

 water. 



Goat 331 was inoculated in the same manner with the blood of 

 327, and died on the 15th day with similar symptoms. 



I could not detect the slightest difference between those cases 

 and cases of Heart-water produced either spontaneously or by inocu- 

 lation. 



Experiment 6. — To show that goats born and reared on a farm 

 infected with Veld-sickness are not so susceptible to that disease as 

 are goats which have been reared on a clean veld. 



Goat No. 305 from a farm on which Veld-sickness exists was 

 inoculated on the 24th November by intravenous injection of 20 c.c. 

 of the blood from a calf which had died of Veld-sickness. A slight 

 reaction followed immediately, and soon subsided. 



On the 1 2th January it received intravenously 30 c.c. of the 

 blood of 327 at the same time as No. 331 of the previous experi- 

 ment. 



While this goat remained unaffected the clean goat No. 331 

 died. 



Kxperiment 7. — To show that goats reared on a farm infested 

 with Veld-sickness are relatively insusceptible but not immune. 



Goat No. 315 from a Veld-sickness infected farm was inoculated 

 on the 14th December with 10 c.c. injected subcutaneously and 

 10 c.c. intravenously of the blood of a calf which died of Vel.d- 

 sickness. 



A slight febrile reaction of short duration followed. On the 

 1 2th Januar}' it received 30 c.c. intravenously of the blood of No. 

 327, and as a result died of the disease on the 13th day. (This 

 result is in agreement with what we find obtaining among goats 

 running on a Heart-water veld when these are inoculated with 

 Heart-water.) 



Experimental Observation 8. — To show that goats reared and 

 running on a farm infested with Veldziekte are relatively insuscep- 

 tible to Heart-water. 



In my prefatory remarks I alluded to the fact that goats pur- 

 chased on the farm of Mr. G. Palmer (which is a Veld-sickness 

 infested farm) were relatively insusceptible to Heartwater but not 

 immune, since although they very frequently resisted the intravenous 

 injection of Heart-water blood, yet if a second inoculation was made 

 at a later date they commonly succumbed. 



Experiment g. — To prove that goats relatively insusceptible are 

 not actually immune. 



In almost every case where one of the goats from Mr. Palmer's 

 farm, inoculated with virulent blood either from Somerset Station, 

 Koonap, or that obtained by me from experimental goats, have with- 

 stood the intravenous injection of virulent blood I have found : — 



I. That they have been actually infected, although showing 

 no signs of disease, since with their blood I have been able to infect 



