414 THE MODERN HORSE DOCTOR. 



limbs, such as grease, bad thrushes, &c. ; allowing the animal tc 

 stand in cold draughts when perspiring freely, or checking the 

 perspiration suddenly by riding him into a stream of cold water." 

 — Veterinary Homoeopathy, by Surgeon Haycock. 



Treatment. — The best treatment the author knows of is, to 

 apply diluted tincture of arnica externally, and give twenty grains 

 of hydriodate of potassa twice daily. 



ON THE GADFLY GRUB FOUND BENEATH THE SEIN 

 OF THE HORSE. 



"We know that the horse harbors several species of ces- 

 trides, or gadflies, in his body, of which those best known are 

 the cestrus equi, the oestrus veterinus, and the oestrus hcem- 

 orrhoidalis, whose habitations are the stomach and intestines. 

 But what we do not seem to be generally aware of is, that un- 

 der the skin, even, larvce, or grubs, of the diptera family breed 

 and give rise to the formation of tumors analogous to such as 

 strike our notice, at certain times of the year, upon the bodies 

 of our large ruminants ; and particularly of those who appear, in 

 all other respects, to enjoy the best health. Redi and Huzard 

 (the father) have spoken of these inhabitants of the skin, of the 

 horse. Bracy Clark, likewise, has mentioned them in his Essay 

 on Bots ; but he regards them as identical with those of the 

 hypoderma species which exist underneath the thick skin of 

 the ox. 



" Dr. Roulin, of the Institute, in his Researches on certain 

 Changes observed in domestic Animals transported from the Old 

 to the New Continent, expresses himself as follows : ' In the 

 hatos of Llanos, the horses are almost entirely left to themselves. 

 They are driven up only from time to time to keep them from 

 becoming quite wild, to take off them the larvce of the cestri, and 

 to mark the foals with a red-hot iron. To what species do these 

 American larvce belong ? As yet we remain in ignorance of 

 this.' Last of all, M. Loiset, a celebrated veterinary surgeon 

 of the Department of the North, published, some years ago, a 

 short Notice on the CEstrus Cuticolens of the horse, and has given 

 a description of the larvce of this cestrus, of which we have, ac- 

 cording to the text, made a full copy. 



