118 THE EEPORT OF THE No. 36 



Dr. Toreance: Might I be allowed to say another word in connection with 

 the last fact brought out by Mr. Treherne. There is a portion of the North-west 

 territories in which the disease known as Mange of cattle has been in existence 

 for some time. This is known as the " Mange Quarantine ' Area," in which we 

 require the dipping of all cattle. It has been found that in this area it has also 

 had the effect of lessening the ravages of the warbles. The skins of the cattle in 

 this district are more free from warbles than they are anywhere else. 



Dr. Fernald: It certainly seems that the two papers here this morning 

 have contributed much of interest to this subject. I am very glad, indeed, that I 

 •can now change a statement made to my junior students that the eggs of the 

 warble fly are licked off into the mouth, and give something that is more accurate. 

 I have thought for many years that there was room for more work on this 

 subject, but certainly in the regions where I am now living these flies are not 

 abundant enough to cause much attention and the opportunities for their study 

 have been few. In connection with Professor Lochhead's paper, the attitude 

 some of his correspondents have taken has been paralleled by an experience of my 

 own. A case was recorded this fall of a house having been so infested by fleas 

 that it was impossible to live in it. The members of the family were very anxious 

 to know what could be idone. I naturally, under the circumstances, gave out 

 the remedy for fleas. When the specimens came in accompanied by the state- 

 ment that it was unbearable to live in the house on account of the bites of 

 these fleas, the specimens were those of the Pomace Fly. 



Mr. Payne: I understand, Mr. Treherne, that Dr. Hadwen has found in 

 the migration of the second stage larvae that they pass down the spinal cord, is 

 there anything in that? 



Mr. Treherne: As far as I understand, Mr. Payne, the eggs, if laid on 

 the knee, for instance, hatch and the larva passes up by the fibrous tissue route 

 until it reaches the stomach, and after stopping there for some time it proceeds 

 in a direct line to the back of the animal, emerging, however, horizontally in 

 the last stage. 



Mr. Petch: Hypoderma hovis in the counties of Huntingdon and Chateau- 

 guay has proven to be a very injurious insect, and as these two counties are 

 practically a dairying district, I would like to know if Dr. Hadwen has found any 

 appreciable effect on the milk supply. 



Mr. Treherne : The irritation produced by larvae within the bodies of cattle 

 does not seem to affect the milk supply to any great degree, but the presence of 

 the fly in the pasture field and its terrifying effect, may easily be understood to 

 effect milk yields. 



The President: The only damage caused, Mr. Petch, seems to be that the 

 ^cattle are bothered while feeding. 



Prof, Lochhead: There is a suggestion in connection with one of the letters 

 which I received and which, I think, this Society could take up, that is, the 

 removal of the warbles before spring from the backs of the cattle. If all the 

 farmers co-operated and removed the warbles before the first of April I think 

 it would soon control this warble fly and, atany rate, it would be worth while 

 trying. I would like to hear what the Society thinks of such a move. 



The President: As Professor Lochhead no doubt knows, that system has 

 been followed in Europe, especially Germany and Denmark. It is customary 

 to appoint a man to go around extracting the warbles, making a small charge 

 per head and it certainly accomplishes much good, and I recommended in my 



