238 A TICK-RESISTANT CONDITION IN CATTLE. 



No. 11. The skin lesions referred to by Mr. Hull and 

 from which he obtained his alleged vaccine, are caused by 

 ticks, since if the cattle be kept free from ticks then no such 

 lesions will develop. 



No. 12. In one experiment the cows were kept free 

 from contact with any other animal and yet developed 

 ticks. It is only on rare occasions and with the greatest 

 difficulty that mature ticks, after removal, can be made to 

 reattach themselves to the same or other animal while 

 with partly or fully engorged females this is an impossibility. 



Nos. 16 and 17. Eggs laid by ticks taken from the two 

 cows hatch out as rapidly at all seasons of the year as eggs, 

 of ticks taken from other cattle. 



Nos. 18 and 20. There is practically no difference 

 between the nature of the infestation of the so-called proof 

 cattle and that of ordinary cattle during either the winter 

 or summer months. 



No. 10. Hull's statements in regard to increase in 

 temperature were not borne out by Pound's observations. 



No. 21. See No. 1. 



No. 22. The statement is refuted by the fact that 

 ticks will readily mature on the so - called proof cattle, 

 since 135 fully mature ticks were recently taken off Tinker- 

 bell in one day. 



Since we have not considered Mr. Hull's claims Nos. 

 13, 14, 15, 23, 24 and 25, as having any bearing on our 

 subject we have not mentioned Mr. Pound's replies to them. 



We recently asked Mr. Hull to inform us as to which 

 of the '' claims " above mentioned are still maintained by 

 him. In reply (dated 17-10-18) he quotes Nos. 1, 2, 3, 4, 

 6, 7, 10, 11, 14, 15, 18, 23, 24, in their entirety ; in regard 

 to No. 5 the ticks do not necessarily die while " very- 

 minute " as some continue to live and grow, but the majority 

 of these do not become engorged and as a consequence are 

 not fertile ; No. 8 is modified to the extent that he admits 

 the possibility of some cases of apparently hereditary 

 transmission being really due to " contact " ; No. 9 needs 

 amendment since in one case the exudate made its appear- 

 ance in the first year of a calf's life (Tinkerbell III) — a 

 tick free animal ; in regard to No. 21 the estimate is excessive 

 in many cases. 



