Diseases of poultry; their etiology, Diseases of poultry; their etiology, diagnosis, treatment, and prevention diseasesofpoultr01pear Year: 1915 External Parasites 221 the birds most likely to be infected are those with a deficient supply of oil in the skin. The conditions which favor its -'''TV: 'V. Fig. 44. — Photograph of the six-legged larva of Knemidocoptes {Derma- torydes) mutans. (After Haiduk.) spread in a flock are dry, barren runs, especially on alkaline soils or in yards filled with ashes or cinders. Foul roosting places also favor the spread of the disease. The disease is

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