438 Veterinary Medicine. 



muscles of swine, sheep, cattle, etc., known as Balbiana Gigan- 

 tea, Rainey's cysts, and Mieschner's tubes, appear in the 

 form of an elongated ovoid mass, composed of an aggregation 

 of cells, and without any sign of a convoluted worm in the 

 interior. These may be so abundant that the flesh is soft, 

 flabby, wet and yellow, green or gray. Isolated tufts of acti- 

 nomyces musculorum suis may be mistaken for trichina cysts, 

 the more so that they are common in the pillars of the diaphragm 

 and in the abdominal walls. They are more rounded than tri- 

 china cysts, usually much larger, and the surface shows a mul- 

 berry appearance from the clustering outer cells of the tuft which, 

 like the mycelium, have a concentric arrangement. There is no 

 enclosed worm. (See Actinomycosis). Unlike trichinae this is 

 common in the heart. Smoked hams sometimes show white 

 points, vLsible to the naked eye, and due to the precipitation of 

 tyrosin usually as needle-like crystals in bundles or sheaves. 

 This is soluble in acids, alkalies or hot water, but insoluble in 

 chloroform or ether. In the interfascicular muscular connective 

 tissue of pork is sometimes found a young ovoid distoma with a 

 sucker at one end and about 5 mm. in length. It is grayish in 

 color, though usually with a red congested covering, audit moves 

 actively wheu raised to the normal body-temperature. I,ike tri- 

 chinae this is found especially in the pillars of the diaphragm 

 (Duncker, Leuckart, Pagenstecher, Hess), and in the laryngeal 

 muscles (Happen, Muhle). Its genital organs are very rudi- 

 mentary, indicating that the pig is an intermediate host and that 

 its full development, by which it may be fully identified, must be 

 looked for in some other animal. (See below, agamodistoma.) 



The embryo lung worms (Strongylus Paradoxus) may 

 be carried by the knife and lodged on the muscle, but may 

 be distinguished by the broad head and anterior part of the 

 body, the tapering tail and the absence of the characteristic 

 cellular structure of the trichina. Finally in old, smoked, dried 

 hams, cheese or sugar mites sometimes settle and might appear 

 like cysts to the naked eye. A magnifying lens or microscope 

 brings out their true structure and corrects this error. 



Classification of Inspected Pork. Under the Bureau of 

 Animal Industry inspected pork is classified as follows : 



" Class A. Samples in which there are no signs of trichinae 



