PABASITES AND PARASITIC DISEASES OF HORSES 



53 



settling tank of any kind should have an outlet at least 4 inches from 

 the bottom in order that the clear liquid may be drawn off without 

 becoming mixed with any of the sediment. 



When the sediment has fully settled draw off the liquid into the 

 dipping vat and add warm water to make a total of 100 gallons of 

 dip. When mixed and cooked as specified above the concentrate is 

 three and one-third times the strength required for the dip in the vat, 

 so that to every 30 gallons of such concentrate 70 gallons of warm 

 water should be added to make a dip of the required strength. 



In preparing lime-sulphur dip in large quantities several hun- 

 dred gallons of concentrate are often made at one time in a single 

 large cooking tank. The quantity made at one boiling is limited 

 only by the facilities at hand. If the boiling tank is of sufficient 

 capacity, a large enough quantity of dip should be cooked at one 



Figure 36. — Cage vat in operation 



time to dip the herd. The quantity of mixture in the cooking tank 

 may be varied at will, but the proportions of the various ingredients 

 should not be altered. 



NICOTINE DIPS 



The nicotine dips sold under various trade names are commonly 

 used for dipping animals and spraying plants for insect pests. 

 They are efficacious remedies for horse lice and mange when diluted 

 with water so that the solution contains not less than five one-hun- 

 dredths of 1 per cent nicotine. If used much stronger, they are 

 liable to injure horses, especially if the animals are dipped while 

 they are warm from exercise or hot weather. 



Nicotine dips are generally used warm, but should not be heated 

 above 110° F. The temperature of the bath should be maintained 

 at 90° to 95°. Sulphur is sometimes added to nicotine dips in the 

 proportion of 16 pounds of flowers of sulphur to 100 gallons of 



