BY T. HARVEY JOHNSTON AND M. J. BANCROFT. 281 



is more common among Jersey and Jerse>' grade cattle 

 than any other race. The fine short hair and the rather 

 oily skin, which give manv Jerseys their sleek, glossy 

 appearance, are probably factors which hel]) to determine 

 tick resistance. Individual animals, however, of Short- 

 horn, Ayrshire. Hereford or Hoi stein strain and crossbreds 

 of these races have been found as strongly resistant as any 

 Jersey. 



Effect of food on Resistance. 



The reputed beneficial effect of feeding sulphur to stock 

 has frequently ])een mentioned in literature. Tr3on 

 (R.8.C., 1915, p. 49) stated that this sulphur administration 

 is alluded to in the Agricultural Journal of the Gape of 

 Good Hoj^e* as having been formerly favoured there. 

 It is recommended by C. A. Barber in his article on the 

 Tick pest in the Tropics, f and is also mentioned as being 

 an Argentine remedy J 



In their report on Tick Fever (1890, pp. 11, 13, 32) 

 Dr. J. S. Hunt and Mr. W. Collins reported on the experi- 

 ments of Dr. Norgaard on the internal ad'ministration of 

 sulphur. The latter had noticed tliat cattle drinking 

 from sidphurous wells were always free from ticks and that 

 tick-infested cattle ))rought to sucli wells woidd after a few 

 days lose all their ticks and remain tick-free, so long as 

 they continued to drink such water. Efforts Avere being 

 made to jn-epare sulphurous water artificialh' by boiling 

 lime and sulphur. Dr. Norgaard was sanguine of success, 

 though the results of his experiments had beeti negative up 

 till that time The members of the Commission stated they 

 had seen tick-infested cattle which had access to sulphur- 

 impregnated water. Ranch OAvners in Texas claimed 

 however, that by feeding sulphur and salt they could to 

 a certain extent relieve their cattle from infestation. These 

 facts are also quoted by Try on (R.S.C., 1915, p. 49). Hunt 

 and Collins considered that this treatment seemed worthy 

 of further trial as it had been favourably reported on from 

 the Argentine Republic, although experiments Avitnessed 

 in America had failed. 



*Vol. viii., No. 16, p. 421. 



tNature, 1895. 



J" Pastoralists" Review." 1896, p 344. 



