BY T. HARVEY JOHNSTON AND M. J. BANCROFT 177 
We feel justified in reiterating our previous remark 
(1918, p. 247), that the evidence before us was sufficient 
to justify the statement that under conditions of ordinary 
natural infestation, the test cattle did not mature ticks in 
sufficient numbers to require any treatment to prevent 
tick worry (claim No. 2). 
The report criticised by Mr. Pound was merely an 
abstract from the larger paper and owing to inadvertence 
an error was introduced. We do not agree with claim 
No. 3 in the short report (1919. p. 31). That such is the 
case is readily seen by a perusal of the report (p. 34-5), as 
well as Mr. Pound’s remarks relating to the transmissi- 
bility of tick resistance.* We know that disease resistance 
is a hereditarily transmissible quality both in plants** and 
-animals. t 
Mr. Pound (p. 38), states that our remarks relating to 
the death of one of the anima’‘s (Clover) were not borne out 
‘by Mr. Hull's letters, and yet he goes on to say (p. 39) 
that he was greatly surprised to find that the animal which 
was returned to him was not Clover but Tinkerbell. We 
have already referred to the confusion regarding the two 
animals (1918, p. 247). We have a letter from Mr. H. A. 
Jones, Secretary of the Wide Bay and Burnett Pastoral 
-and Agricultural Society, dated Ist February, 1916, con- 
‘taining a report from Messrs. Butcher and Rex who had 
‘the two animals under their care. The names of the two 
cows were transposed. ‘* Tinkerbell’’ (¢.e., the real 
‘Clover), as a result of drought, became low in condition 
-and badly infested with ticks, a minor accident, together 
with age and poverty, causing her death. 
*In reference to our suggestion (1918) that the serum of tick resistant 
-cattle may differ from that of non-resistant animals, it is of interest to 
“note that Hall and Wigdor (Arch. Internal Medicine, Nov., 1918, 22, pp. 
601-9), in their experimental study of serum therapy in Trichinosis refer 
‘to the effects of injecting serum from recovered individuals as a means of 
-counteracting trichina poisoning. 
**Disease resistance in plants has been made use of economically, 
-¢.g., Phylloxera resistant stocks for grapes, rust resistance in wheat, etc. 
‘See also Botanical Abstracts 1 (4), Dec., 1918, p. 155, No. 903. 
+Metchinkoff, Immunity in Infective Diseases, Cambr. Univ. Press, 
1907, p. 445, ete. 
SN 
