23 



under the conditions 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 leng1:h of time there is a separa- 

 tion 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 naph- 

 thalene and other constitutents 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 ap- 

 prove their dips for official dipping should submit a 

 sample of their product to the Bureau of Animal In- 

 dustry 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 his 

 product which is approved by the Department of 

 Agriculture. 



(2) To maintain his product of uniform composi- 

 tion. 



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

 approved the following statement: 



A sample of this product has been submitted to the 

 Department of Agriculture for examination. AYe 

 guarantee the contents of this package to be of the 

 same composition as the sample submitted to the De- 

 partment, and that when diluted according to the 

 directions printed hereon for the treatment of sheep 

 scab it will give a dipping fluid of the composition 



required of a " dip by the regulations of the 



Secretary of Agriculture governing sheep scab. 



(4) To have on containers or advertising matter 

 no reference to the United States Government or 

 any of its Departments except as provided in the 

 preceding paragraph. 



" There should be inserted here the name of the class of 

 dips to which the product belongs, such as '* cresol," or 

 •• lime and suiohur." etc. 



