248 PAEASITIC DISEASES OF THE SKIN. 



where large flocks are infected, thorough dippings of all the sheep 

 is the only practicable method of combatting the disease. 



Dippingf. 



Under this head we cannot do better than quote verbatim 

 some of the instructions given out by the Department of Agri- 

 culture in a bulletin lately issued dealing with the subject. 



"(1). Select a dip containing sulphur. If a prepared 'dip' 

 is used, which does not contain sulphur, it is always safer to add 

 about sixteen and one-half pounds of the sifted flour of sulphur 

 to every 100 gallons of water, especially if after dipping the 

 sheep have to be returned to their old pastures. 



"(2). Shear all the sheep at one time, and immediately 

 after shearing confine them to one-half the farm for two to four 

 weeks. Many persons prefer to dip immediately after shearing. 



"(3). At the end of this time dip every sheep (and every 

 goat also, if there is any on the farm). 



"(4). Ten days later dip the entire flock the second time. 



"(5). After the second dipping place the flock on the por- 

 tion of the farm from which they have been excluded during the 

 previous four or five weeks. 



"(6). Keep each sheep in the dip for two miniites by the 

 watch, do not guess at the time, and duck its head at least once. 



"(7). Be careful in dipping rams, as they are more likely 

 to be overcome in the dip than are the ewes." 



Be careful in making your choice of a dip. In these days, 

 when manufactured non-poisonous preparations are obtainable 

 there is no excuse for endangering the lives of the sheep, and not 

 them only, but those of the other live stock of the farm by using 

 poisonous compounds, especially those heavily charged with 

 arsenic. In regard to arsenical dips, the United States Depart- 

 ment of Agriculture, in the bulletin already quoted from, says: 



There are both home-made arsenic dips and secret proprie- 



