216 NATURAL HISTORY MISCELLANY. 
escent stage they may remain alive for many years, and after 
death of their host may become mature in turn by entering the Pha 
tinal canal of some other host. 
The symptoms caused by their presence in man vary according to 
the number eaten and the stage of development. At first nausea, loss 
of appetite, and intestinal irritation. Afterwards debility, fever, œde- 
e 
glutition, speech, and respiration, and finally death from exhaustion. 
only a small quantity of the trichinous pork be eaten, the symptoms 
will be mild, and in all cases res will disappear when the worms have 
become PEARES or encysted in the muscular tissu 
The history of the trichina is s interesting, and pi be briefly told as 
encysted, in the flesh of the hog, and since then it has often been no- 
ticed in dissecting-room subjects, giving a sanded aspect to the red 
muscular tissue. It was always considered harmless, however, and 
in 1855 Kiichenmeister published a theory that it was only the imma- 
ture form of Trichocephalus dispar, a minute thread-like intestinal 
Experiments conducted by Virchow and Leuckart, however, 
ra 
fibres, not, as had been supposed by some observers, GD the capil- 
lary tubes. 
These results pointed unmistakably to the manner in which 
-hospital at Dresden, after a month’s sickness, with symptoms like 
those above mentioned, and on examination after death Zenker found 
‘the muscular system filled with free and moving trichine. He con- 
-cluded that it, was a case of fresh infection, and that the worms had 
-been the cause of her death. A microscopic examination of the con- 
_ tents of the intestine | rerealed the presence of numerous mature tri- 
exon tha ales st s. Por- 
tions of the muscular tissue of the os 
