TRANSFERENCE BETWEEN MAN AND BEAST. 



155 



as do animals with which we are associated. The foregoing remarks 

 have had reference specially to the Entozoa, but these are far from 

 being the only parasites which we derive from our association with 

 other men and animals. It is in fact still more true of the Epizoa, 

 whose transference takes place exclusively in this way. Lice, fleas, 

 mites, find their way to us only through more or less direct contact 

 with other organisms, and may be transferred in all forms, not only as 

 eggs, but also, and that more commonly, in their adult state. 



It is in the highest degree improbable that Entozoa are ever trans- 

 mitted as adult organisms. Klichenmeister has indeed maintained 

 this in regard to Oxyuris, and affirms that it may pass from a man 



FIG. 91. Flesh of pig with bladder- 

 worms (nat. size). 



FIG. 92. Flesh of pig with Trichina:. 

 (x45.) 



to his bedfellow. The supposition has at first sight much probability, 

 for these worms at certain periods, and especially in the evening, 

 issue spontaneously from the anus, and wander round about. I have 

 even seen a patient in whose case the Oxyuris had during a night- 

 sweat ascended as high as the shoulder. 1 But since the transference 

 could only take place per anum, that presupposes circumstances 



1 Michelson describes a case (Berliner Uin. Wochenschrift, No. 33, 1877) in which the 

 Oxyuridcs had occupied the diseased groin of a boy for a dwelling and breeding place. 

 Compare also the observations previously cited (p. 144) as to the occurrence of Nematodes 

 on diseased skin. 



