684 EXPERIMENT STATION RECORD. I Vol 40 



Salt poisoning in swine, H. C. H. Kernkamp (Cornell Vet., 9 (1919), No. 1, 

 pp. 58-60). — A brief account in which cases of salt poisoning among pigs are 

 reported. The author concludes that a very small amount of salt will produce 

 symptoms of poisoning and death in pigs, although pigs receiving a small 

 amount of salt from day to day appear to develop a tolerance to it. 



The control of lice on horses, with especial reference to winter conditions, 

 M. C. Hall (Vet. Jour., 74 (1918), Nos. 517, pp. W-258; 518, pp. 278-284).— 

 " The best control measure for lice on horses is eradicative dipping in summer. 

 There are numerous aqueous solutions that are satisfactory, the ones in most 

 common use being the coal-tar dips. These preparations are effective, unin- 

 jurious, comparatively cheap, and readily obtainable. Their use in winter is 

 feasible at times, but is limited by the danger of chilling and consequent pro- 

 duction of pneumonia. Eradication dipping calls for two dippings at a 20-day 

 interval. 



"Of the volatile substances that may be used for lice control in winter, 

 methyl alcohol seems to be the most satisfactory of the things tested, as it is 

 effective, is not too expensive, and does not injure the hair or coat. It is 

 inflammable and somewhat unpleasant t<> handle. It can not be depended on to 

 kill eggs, so two treatments at a 20-day Interval are indicated. 



"(>f the fatty "i- oily substances that may be used fur lice control in winter, 

 horse fat appears to be a fairly cheap and satisfactory representative. It 

 should be melted and applied, and the excess promptly scraped off with a 

 sweat scraper. After treatment the horses should be thoroughly groomed 

 daily to remove the fat which Sows to the tip of the hairs. The treatment has 

 the disadvantage of greasing the Clothing, stalls, harness, and other things with 

 which it comes in contact. Contrary to what one might expect, horses so 

 treated will be colder in very cold weather than horses not treated. 



"It is nonirritant, but if it is left on and the horses are not groomed for 

 several days, it has a depilatory action. It appears to be injurious to cu'lts, 

 but some euu's will hatch after this treatment so that eradication would call 

 for a second treatment at a 20-day Interval. Most oils, whether fixed or 

 volatile, are depilatory for horses, and the volatile oils are commonly irritant 

 as well, producing dermatitis. 



"Powders do not appear to be very satisfactory substances for the control 

 of lice on horses. They are not specially effective on man, where conditions 

 are better and where many tests of various preparations have been made. They 

 apparently exert no effect on the eirus and can only be regarded as palliative, 

 killing a few lice and temporarily stupefying or disturbing others. 



" Fumigation with sulphur dioxld appears to be a dependable measure for the 

 control of lice on horses, but It has only limited application. It appears to be 

 a useful measure in the Army, where it is intended primarily as a treatment for 

 scabies." 



The oviposition habit of Gastrophilus nasalis, A. El CAMERON (Science, 

 n. ser., .',!> (1919), No. 1853, p. 26). — The author finds that (i. nasalis never 

 strikes at the lips of the horse but always at the hairs of the skin between 

 the mandibles and sometimes on the hairs of the cheek, and has not been 

 observed to oviposit on the lips. Its eggs are said to be distinct from those of 

 <!. vntestinalis, both in respect to shape and attachment to the hair. They are 

 not adapted for the penetration of the host's skin, and are almost invariably 

 deposited on the hairs of the throat. The author's observations differ from 

 those of Townsend, previously noted (E. S. R., 39, p. 362). 



A note on the effect of cold on the degree of parasitic infestation, M. Wic- 

 DOR (Jour. Amrr. ]'rt. Med. A.880C, 5k (191S). \n. .7. pp. J.W J.iJ). — During the 

 course of anthelmintic investigations with dogs, it was found that freezing tern- 



