Gr. PI. F. Nuttall 
107 
near the elbow and wrist, a narrow strip of absorbent cotton surrounded 
the arm, and light elastic bands held the stocking down on the skin 
immediately beyond the two cotton barriers. A light bandage was now 
applied firmly to the forearm and fixed with safety pins. With this 
arrangement, it was found that the insects rarely escaped from the cell; 
if they did so they could but escape into the stocking, the cotton barriers 
and elastic bands effectually blocking further progress. The contents 
of the cell were inspected daily, the exposure lasting but a few minutes, 
during which counts of eggs and moults were made and the arm cleansed. 
The Wristlet Method. 
After numerous failures in attempting to raise capitis satisfactorily, 
by the usual method employed for corporis (see p. 109), I obtained 
excellent results by the following method (Fig. 2 A—E). Some small 
pill-boxes were obtained at trifling cost from a druggist. A circular 
hole was punched in the pasteboard lid and floor by means of a wad 
punch hammered down sharply upon a sheet of lead. A layer of fine 
chiffon, such as Bacot has used, was placed beneath the floor and tied 
with a silk thread above the rim of the box. Another piece of loose 
chiffon of circular form was held firmly in place between the lid and 
box when the latter was shut. The chiffon,on the floor of the box 
Fig. 2. A. Wrist-strap with broad portion ( B ) tapering abruptly toward the buckle 
( G ) and tapering to a narrow strap (C) at the opposite end. The aperture ( E) 
is cut to fit the sides of the pill-box tightly, when, without its lid (as shown in C), it 
is pushed outward through the opening. The narrow strap ( C ) slips through a second 
aperture ( D) to return to the buckle when the strap encircles the arm as shown in the 
succeeding figure. 
B. Wrist-strap with pill-box as worn on the arm. Carried on the left arm by 
day and on the right arm by night. A and B are drawn to the same scale as indicated 
below. 
C. A screened pill-box as seen in cross section; the solid parts of the box in 
black. (A) the strap; (T) the top; ( B) the bottom; ( 0 ) the circular aperture in the 
lid and bottom. ( T.C .) the top chiffon which slips in between the lid and box rim 
when, the latter is closed. ( B.C .) the bottom chiffon gummed to the under surface 
around the central aperture, and tied by ( S ) a thread of silk above the rim. ( H ) the 
hair-grid. 
D. Lidless pill-box showing ( H ) the hair-grid at the bottom, resting directly over 
the screened aperture (0) in the floor. ( S ) the silk thread which holds the chiffon 
firmly in place. (C and D natural size.) 
E. Magnified portion of shellacked chiffon, with thirty-six strands per cm., 
showing the relative size of an unfed first stage larva of capitis to the openings 
in the screen. 
