1901} MICROSCOPICAL JOURNAL. 95 
TRICHINA SPIRALIS.—The larvae of this parasite appear 
in the muscular tissue of man after the ingestion of un- 
cooked, infected pork. They make their appearance ear- 
ly in the diaphragm, frontal, and muscles of the leg. The 
material to be studied is collected by the physician in the 
following manner: The site of incision is over the outer 
head of the gastrocnemius muscle, and after this area is 
surgically cleansed the parts are anezthetized by injecting 
a solution of cocoaine hydrochlorate. First inject the skin 
and then deeper structures down to the sheath of the mus- 
cle. When anesthesia is produced an incision is made di- 
viding all tissues to the muscle’s sheath, which is grasped 
by a rat-tooth forceps and incised, after which a small 
Fic. 3.--T. echinococcus. Scolex Fic. 4.—Turichina spiralis in mus- 
and hooklets (B. L., 1-6) cle from outer head, left gastroc- 
nemius. ‘Twenty-first day of dis- 
ease (Queen,%). 
portion of the muscle is dissected and placed in a vessel 
containing water. Glycerine and alcohol arrest all move- 
ments of the parasite. This wound is now closed and 
dressed antiseptically. A small piece of this tissue is 
placed on a slide and teased, by means of fine needles, un- 
til most of its tbres appear to be separated. The addi- 
tion of a few drops of water to the specimen renders the 
teasing process less difficult. The slide is now viewed un- 
der a low power (%), and if trichinw are present their rec- 
