94 THE AMERICAN MONTHLY (Apr 
til the worm is cleansed. The worm, with the water sur- 
rounding it, is now transferred to a clear glass dish 10 x 
12 x 3 inches, which is placed on a white surface (towel) 
and all large segments are removed by a glass rod, draw- 
ing them over the edge of the dish, when they are allow- 
ed to fall into a second dish containing water; care be- 
ing taken not to break the parasite. 
After all large segments are removed the head is usu- 
ally readily detected, by the naked eye, floating amongst 
the remaining thread-like portions of the parasite. In 
searching for certain small parasites a hand-glass may be 
found for service. The head is transferred to 50 per cent 
glycerine and preserved for further study. In mounting 
parasite heads, a slide provided with a concavity of suffi- 
cient depth to accommodate their thickest portion, is most 
satisfactory. They are well preserved when mounted in 
Farrant’s medium, cast medium, glycerine and glycerine 
jelly (Fig. 2—1 Natural size ; 2 head ; 3 ova). 
Tania Ecuinococcus (Doa TaPpE WormM).—Here the 
problem is somewhat different, as man is the intermedi- 
ary host, and in him develops the head, or scolex of the 
parasite only. Hach head is provided with a crown of 
hooklets, and many free hooks are often seen in connec- 
tion with shreds of finely granular, yellowish membrane 
(Fig. 3). Hooklets, scolices and membrane from the cysts 
of the echinococcus are occasionally found in sputum, pus 
from abscesses, the fluid of cysts, feces and urine. Hook- 
lets are best studied under a % lens, while the heads may 
be detected under a much lower power. It is these find- 
ings which enable one to recognize the parasite, and the 
hooks may be the only evidence present. In the study 
of this parasite a low power of illumination is necessary, 
and the skillful manipulation of both Abbe condenser and 
iris diaphragm afford great assistance. Products of the 
echinococcus may be mounted in any of the above mount- 
ing mediums. 
