BUKEAU OF AXIMAL INDUSTRY. 157 



from dofis and foxes and is beino; extensively used for this purpose 

 and for the removal of ascarids from these animals, as it appears to 

 be much safer for these animals and only slightly less effective in 

 removing ascarids than is oil of chenopodium. It promises to be- 

 come established as the best drug for the removal of the human 

 hookworms. The experiments carried on during the past year indi- 

 cate that it will find further uses against other worm parasites in 

 man and several of the domesticated animals. A few experiments 

 with a mixture of carbon tetrachlorid and castor oil failed to show 

 that this remedy is efficacious in removing thorn-headed worms from 

 swine. 



Studies of treatment for demodectic man^e in dogs, in cooperation 

 with the Insecticide and Fungicide Board, nave been continued with 

 a view to ascertaining some dependable treatment for this refractory 

 • disease. 



A new species of gullet worm, Gongylonenia rarwojni, occurring in 

 the tongues and gullets of swine has been described and provisions 

 are now in effect in the Federal meat-inspection service for removing 

 these worms from hog tongues. A study of the regional distribution 

 of this parasite in this country indicates that in certain areas swine 

 show a high degree of infestation while in other areas swine appear 

 to be free from infestation. 



Additional work has been carried on in regard to strongyles of 

 horses and the adult tapeworms of sheep and cattle. 



Confirming the work of other investigators, experiments in in- 

 fecting chickens with Ascaridia perspicillum have failed to show that 

 the larvae of this parasite pass through the lungs before settling 

 down in the intestine to develop to maturity. 



During the year 1,129 fecal samples from imported sheep dogs 

 were examined"^ for parasites that might be injurious to livestock. 

 Of these, 126 were foimd infested with tapeworms of the genus 

 Taenia and were subjected to anthelmintic treatment before release 

 from quarantine. 



Publications issued during the year includa studies on the preven- 

 tion of intestinal worms in pigs and on pig parasites and thumps. 

 Papers were published outside of the department dealing with 

 ascarids in swine, migration of larval ascarids in the body of the 

 host, danger to children from playing in hog lots, unusual parasites 

 of swine, notes on hookworms, a Syngamus from a calf, the guinea 

 pig as a host of Ardu^nna strongylina and of Hymenole'pis nana, 

 the possible effect of heat on stomach-worm larvae, the occurrence of 

 the swine kidney worm in cattle, animal parasites of foxes, lung- 

 worms of domestic animals, relative value of treatment and 

 prophylaxis in parasitic diseases, treatments for gastrointestinal 

 parasites of horses, carbon tetrachlorid for removing hookworms, 

 occurrence of Dipylidium sexcoronatmn in the cat, a tapeworm from 

 a whale, parasites of an African wolf, Hymenolepis farciminosa in 

 the United States, horse strongyles, bots, gid, animal experimenta- 

 ticm, and miscellaneous notes on nematodes. 



The Index-Catalogue of Medical and Veterinary Zoology has 

 been continued and preparation made for publishing additional 

 parts of this highly valuable work. 



