BUREAU OF ANIMAL INDUSTRY. 273 



These experiments showed that tobacco dips without sulphur will 

 cure sheep scab. Whether sulphur may safely be omitted in actual 

 practice remains to be determined. 



CATTLE MANGE. 



Two series of experiments in the treatment of cattle mange by 

 means of a si^igle application of a kerosene-soap jDreparation were 

 conducted under the immediate direction of Dr. W. E. Howe, of this 

 Bureau. The dip was apparently successful in one series. In the 

 other series it failed to cure all of the cattle in the experiments. It 

 is planned to try the dip again during the coming 3'ear, using a 

 higher percentage of kerosene. 



Observations were made in Texas indicating that two dippings in 

 an arsenical dip containing an equivalent of about 8 ])ounds of arsenic 

 trioxid to 500 gallons of dip are insufficient for the cure of cattle 



mange. 



INVESTIGATIONS RELATIVE TO TICK ERADICATION. 



A bulletin including the results of two years' investigations rela- 

 tive to the life history of the cattle tick and other points bearing on 

 tick eradication, which were conducted in cooperation with the veter- 

 inary department of the Alabama Polytechnic Institute, has been 

 prepared for publication. 



Farmers' Bulletin 3T8, on methods of exterminating the cattle tick, 

 was issued during the year. 



A bulletin including the results of several years' investigations of 

 arsenical dips as remedies for cattle ticks has been prepared. In this 

 bulletin it is shoAvn that an arsenical dip containing an equivalent of 

 10 pounds of arsenic trioxid, 25 pounds of sal soda, and 1 gallon of 

 pine tar to each 500 gallons of dip may be effectively used to free 

 cattle from ticks, provided two dippings are given at an interval of 

 from seven to ten days. 



An investigation of a proprietary arsenical dip containing on dilu- 

 tion an equivalent of about 8 pounds of arsenic trioxid to each 500 

 fallons shoAved that cattle could be almost entirely freed from ticks 

 y two dippings at an interval of ten days. 



In April, 1910, under supervision of an inspector of this Bureau, 

 about 2,000 cattle were dipped twice at an interval of seven to ten 

 days in an arsenic, soda, and pine-tar mixture, containing an equiva- 

 lent of 10 pounds of arsenic trioxid to each 500 gallons of dip. Two 

 days after the second dipping a few of these cattle Avere found to be 

 still infested with ticks. An investigation of this dipping was made. 

 The failure to free the cattle entirely from ticks may be explained as 

 probably due to the fact that the cattle were dipped in a short vat. 

 Many of the cattle had not shed their Avinter coats of hair, and a 

 thorough wetting of the body was not insured in passing through 

 the bath on account of the shortness of the vat; hence it is not certain 

 that all of the ticks with which they were infested were exposed to 

 the action of the dip. In the light of this experience it is considered 

 advisable that vats less than 40 feet in lencfth at the surface of the 

 dip should not be used for dipping cattle in arsenical dips. 



73477°— AGB 1910 IS 



