Mites Injurious to Domestic Animals. 41 



and sulphur is recommended as a preventive and for affected horses 

 by the Ministry of Agriculture and Fisheries (see Leaflet No. 274). 

 Noel Fillers gives several formulae for dressings, one of them being 



H.ghlty del 



FIG. 23. 



Pterolichus obtusus (p. 64), a feather mite from domestic fowl. 

 Female from above, x 160. j 



as follows : Strong calcium polysulphide solution one part = 8 oz., 

 water two parts = 16 oz., horse fat two parts = 16 oz., total two 

 pints. He says that the strong solution of calcium polysulphide may 



