[LAR1A. 185 



9. From ear of bullock : — Worm-nests on brisket. Upper 

 Hunter River, New South Wales. 

 10. From ear of bullock: — Worm-nests on both briskets, 

 sixth and eighth ribs. Queensland. 



Twelve similar films from infected cattle, taken from the 

 aortic blood during the day time (6 a.m. to 3 p.m.), were 

 also negative. 



It may be that the embryos can only escape in numbers 

 into the circulation before the fibrous capsule has become 

 much thickened, and hence would be found in this situation 

 in only an occasional animal. It is obvious that, if certain 

 Biptcm are the intermediate hosts, embryos must, at one 

 time or another be fairly numerous in the peripheral blood 

 of certain animals at least, if the frequency of the infec- 

 tion is to be accounted for. . Our results, however, do not 

 support this hypothesis. 



On the other hand quite another analogy presents itself 

 in connection with the guinea-worm (F. medii): u sis, Velsch) 

 of man. This worm after working its way through the 



the leg, where, after piercing the skin, it finally extrudes 

 its embryos which escape into a fluid medium. A species 

 of Cyclops or other freshwater crustacean probably then 



parasite enters the human system in drinking water. 



in this cattle Filaria. One is that the worn 



-nests are 



almost always found in the subcutaneous tissues 



(we have a 



specimen in which the dermis itself is considera 



bly thinned 



by the presence of the developing nodule), anc 



especially 



in those over the brisket, a part of the body \\ 



hich would 



come in fairly close contact with the grounc 



or a fluid 



medium when the animal was lying down or w 



U lowing in 



water or mud. Another is that the screw-lils 



e external 



