552 DISEASES OF CATTLE, SHEEP, GOATS, ETC. 



(c) The cresol dip which consists of a mixture of cresylic acid* 

 set with soap. When diluted ready for use this dip should contain 

 one-half of 1 per cent of cresylic acid. 



(d) The coal-tar creosote dip, which is made by mixing coal- 

 tar creosote or coal-tar oils and cresylic acid separately with resin 

 soap in varying proportions. This dip should contain when diluted 

 ready for use not less than 1 per cent by weight of coal-tar oils and 

 cresylic acid. In no case should the diluted dip contain more than 

 four-tenths of 1 per cent nor less than one-tenth of 1 per cent of 

 cresylic acid; but when fhe proportion of cresylic acid falls below 

 two-tenths of 1 per cent the coal-tar oils should be increased suffi- 

 ciently to bring the total of the tar oils and the cresylic acid in the 

 diluted dip up to 1.2 per cent by weight. 



The cresol dip and the coal-tar creosote dip should always be 

 tested on a small scale with the water and under the conditons to be 

 employed in dipping in order to avoid possible injury to stock. The 

 diluted sample should be allowed to stand for at least an hour. If 

 after this length of time there is a separation of an oily layer, the 

 dip should not be used with that kind of water. Especial care in 

 this connection is necessary where hard water is to be used. 



In the undiluted coal-tar creosote dips there may be, in cold 

 weather especially, a separation of naphthalene and other constitu- 

 ents of the dip. Care should therefore be taken to see that the 

 concentrated dip is homogeneous in character before using any 

 portion of it. 



Manufacturers who desire the department to approve their dips 

 for official dipping should submit a sample of their product to the 

 Bureau of Animal Industry in Washington and accompany this 

 with the formula used in preparing the dip. 



Before a proprietary substance is approved for use in official 

 dipping the manufacturer must agree as follows: 



(1) To recommend for sheep scab a dilution of the product, 

 so as to conform to the requirements of the Department of Agricul- 

 ture. 



(2) To maintain said product at a uniform composition. 



(3) To place on packages of dips which have been examined 

 and found to conform to the requirements of the department the 

 following statement : 



A sample of this product has been submitted to the United 

 States Department of Agriculture for examination. We guarantee 

 the contents of this package to be of the same composition as the 

 sample submitted to the department, and that when diluted accord- 

 ing to the directions printed thereon for the treatment of sheep scab 

 it will give a dipping fluid of the composition required of a f 



*By the term cresylic acid as used in these regulations is meant cresols and 

 other phenols derived from coal tar, none of which boils below 185 C, nor above 

 250 C. 



f There should be inserted here the name of the class of dips to which the 

 product belongs, such as cresol or lime and sulphur, etc. 



