1901] MICROSCOPIOCAL JOURNAL 93 
and on it a coverglass placed. Prepared in this manner | 
the ova are readily seen through a % lens, and when view- 
ed under a @ lens, both their outline and structure are ap- 
parent. Staining is accomplished by Delafield’s hama- 
toxylin and other dyes, but adds little, if anything, to the 
specimen’s value. Study of the segment in its entirety is 
most interesting, but scarcely necessary in clinical work. 
It may be accomplished by placing a segment between 
two slides and clamping them tightly together. Under 
a # lens the segment may be studied, showing the uterus 
stuffed with ova. 
To Drrect THE HEAD.—This being the portion of the 
parasite’s study wherein most failures are experienced, 
and to which most importance is attached, I shall con- 
sider under the following heads: (1) Empty the bowels, 
by means of salines, so that no undigested food remains 
_ in the alimentary tract; (2) the administration of a ver- 
micide ; (3) follow in four to six hours by another saline; 
(4) when it is observed that the worm is beginning to es- 
cape from the rectum, the patient is directed to occupy a 
comfortable seat where the worm can pass into a clean 
vessel containing water; (5) it is all important that the 
patient sit on one commode from the time he observes 
that the worm is diminishing in size, until the entire worm 
is passed ; (the nearer the head, the smaller the segments), 
when within a few inches, 10 to 12, of the head the worm 
appears as a pale slightly flattened thread and its seg- 
‘ments are not distinct ; (6) the head is the last portion of 
the worm to be passed, and as long as any part of the par- 
asite is protruding from tbe rectum the RIAD AD MA Gap are 
that the head has not yet escaped. 
Given a specimen collected in this manner, add to it a 
quantity of water,stir gently with aglass rod, after which 
it will be seen that the worm falls to the bottom of the 
vessel, when decant one-half, or more, of the liquid, which 
is replaced by clean water. This washing is repeated un- 
