BUREAU OF ANIMAL INDUSTRY. 251 



repeated treatments were necessary before the tapeworm eggs disap- 

 peared from the feces. The quarantme and treatment were con- 

 ducted under the supervision of the Quarantine Division. 



SHEEP SCAB. 



The favorable results obtained in the experiments ^vith tobacco 

 dip without sulphur, in cooperation with the Kentucky Agricultural 

 Experiment Station, have been confirmed by the reports of practical 

 dippings in the field by bureau inspectors. Dipping solutions con- 

 taining 0.07 per cent of nicotin were used. Reports have been re- 

 ceived relative to the dipping of 20 lots of sheep infected with scab, 

 comprising 35,515 head, and 1 lot of exposed sheep, comprising 2,950 

 head. E'our of the lots were reported as not exposed to reinfection 

 after dipping, 11 were returned to infected range or pasture, and it 

 was not known in the case of 6 lots whether they were exposed or not. 

 The disease was reported cured in all cases, with no reappearance as 

 determined by inspections made after a lapse of time varying from 

 1 to 6 months in different instances. 



As a result of these investigations the use of tobacco dips without 

 sulphur has been permitted in the official dipping of sheep for scabies. 



CATTLE MANGE. 



Under the supervision of Dr. W. E. Howe, of this bureau, further 

 experiments in the treatment of cattle mange with a kerosene and 

 soap preparation have been carried out. 



On April 14 two lots of mangy cattle (11 and 15 respectively) were 

 treated in a spraying machine with the preparation diluted to give 

 a strength of 8 per cent of kerosene. Five weeks after spraying mites 

 were found in 2 cattle of the first lot and 6 cattle of the second lot. 



On April 15 two lots of mangy cattle (11 and 13) were treated in a 

 spraying machine with the preparation diluted to give a strength of 

 7 per cent of kerosene. Five weeks after treatment mites were 

 found on 2 animals in each lot. 



On April 18 two lots of mangy cattle, of 15 each, were dipped in 

 the preparation diluted to give a strength of 7 per cent. Five weeks 

 after treatment mites were found on 1 animal in each lot. 



Two lots of mangy cattle (14 and 15) were dipped April 19 and 20, 

 respectively, in the preparation diluted to give a strength of 6 per 

 cent. Five weeks after treatment one lot was apparently free from 

 mange; in the other lot 2 animals were found to be infected. 



From these experiments it may be concluded that the kerosene 

 preparation in question is not efficacious in the treatment of cattle 

 mange when used as a dip in a strength of 7 per cent or less or as a 

 spray in a strength of 8 per cent or less, a single application of the 

 remedy being given in either case, even though it is used in the 

 spring of the year, at which time mangy cattle tend to improve in 

 condition without treatment. 



INVESTIGATIONS RELATIVE TO TICK ERADICATION. 



Bulletin 130, recording the results of two years' investigations 

 relative to the life history of the cattle tick and other points bearing 

 on tick eradication, which were conducted in cooperation with the 



