1883.] The Hair-Sac Mite of the Fig. 1113 
After discussing the occurrence of hair-sac mites in man, the 
dog, the cat, the Surinam bat, and in the Meibomian glands of 
sheep,’ he considers the question of the specific identity of the 
parasites in question, and especially the possibility of transference 
from one species of animal to another. He gives a synopsis of 
the various experiments which have been made to determine this 
point. Gruby succeeded in infecting a dog with the Demodex of 
man, and Ziirn relates a case in which a veterinary surgeon, a 
coachman and his wife, who had the care of a dog suffering from 
hes I Fig. 2. Fig. 3. 
he 
D. phylloides ; mare ventral aspect—the sma all fissure near the front of t 
ventral i. of Di abdomen is the an aei in oi this two folds represent the 
Penis, gos 2.—Female, Re aspect othe me toa an egg undergoing 
parais n3 ira al and anal fissure behind the Fic. 3.— Section of 
mn of vig. * ith sebaceous gland fillea with mites; ‘gin inflammation 
_ Demodex-mange, had their hands and feet soon covered with 
` Pustules į in which hair-sac mites were present. 
~ On the other hand Rivolta endeavored, without success, to in- 
fect One dog from another, and Mortemucci failed to transfer the | 
Mites from one part of an affected dog’s skin to another. 
Again, doubtful results are recorded by Friedberger and Weiss. 
It is not infrequent to see dogs perfectly free from the skin dis- 
ee living in the same kennel with affected animals, a circum- 
Stance which points to the conclusion that the conditions which 
vor contagion are often absent. 
io tame 
He ©verlooks the observations of Gros and Faxon. 
