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DISEASES OF SWINE AND OTHER ANIMALS. Sta 
white thread-like worms and myriads of microscopic eggs. In every 
ease the lobules to which such obstructed air-tubes led were red, con- 
gested, and solid, or, as in one or two instances, dropsical, and of a 
slightly translucent, grayish color. Sections of the diseased portion 
- showed the air-cells partially filled with an exudate in which small 
rounded cell-forms predominated. The walls of the air-cells were the 
seat of congested and blocked capillaries and granular cells, while in 
most cases there were superadded the more specific characters of the 
fever—the presence of the worms and their irritation having evidently 
determined the lesions of the specific fever to the infested lobules. 
The worms may be thus shortly described: Head slightly conical; 
mouth terminal, small, circular, with three papille; body like a stout 
thread, white or brownish, skin nonstriated ; cesophagus short, 0.63 mil- 
limeters, enlarged posteriorly, club-shaped (Plate XIII, Fig. 4); intes- 
tine slightly sinuous, and longer than the body; anus opening on a 
papilla a little in front of the tail. Jfale, 8 to 9 lines in length; tail 
curved, furnished with a bilobed membranous pouch supported by five 
rays, two of them double, and two long delicate spicule with transverse 
markings (see Plate XIII, Fig. 5). Female, 1 to 14 inches long; tail 
turned to one side, narrowing suddenly to be prolonged as a short, curved, 
conical point; genital orifice in the anterior half of the body, yet close 
to the middle; oviducts very much convoluted. The ova are slightly 
ovoid ;4, inch in diameter, and appear as if they filled the entire body 
of the adult female (see Plate XIV, Figs. 6, 7, and 8). 
Habits.—Like other strongyli, these worms attain sexual maturity in 
the body of their host, and they lay their eggs in the bronchia, to be 
carried out in all probability and hatched in pools of water and moist 
earth. It is worthy of note that though [found in the bronchia and air 
cells eggs in all stages of segmentation, and those containing fully-formed 
embryos, I did not find a single free embryo worm. The presumption 
is that, ike other closely related worms, they are only hatched out of 
the body, and that the microscopic embryos live for a variable length of 
time in water or moist earth, and on vegetables, to be taken in with 
these in feeding and drinking. 
That these worms are injurious there can be no doubt. Pigs infested 
by them thrive badly, and many die, as did the poorest of my first ex- 
perimental lot. Like all parasites, they multiply rapidly wherever their 
propagation is favored by the presence of large herds of swine, and es- 
peciaily if these are kept on the same range and water season after sea- 
son. In such circumstances they will produce a veritable plague, prov- 
ing especially destructive to the younger pigs. There is little doubt 
that many outbreaks of alleged hog-cholera, in which the lungs alone 
are afiected, are but instances of the ravages of these lung-worms, but 
that they are the cause of the specific fever which we are investigating 
is negatived by the complete absence of these worms in all of my sec- 
ond experimental lot. 
Tricocephalus Dispai (Oreplin) Whip-Worm of Swine.—This I found 
in large numbers in the ezecum and colon of the experimental pigs, and 
especially of the first lot—those that had been ‘fed on raw oftal. This 
worm is characterized by a long, delicate, filiform anterior part of the 
body, and a snort, thick, posterior portion. The narrow portion is 0.02 
millimeters broad and exceedingly retractile; the posterior portion 
may be almost 1 millimeter thick. The tegument is very finely striated 
across, and has a longitudinal papillated band. The cesophagus is very 
wideand slightly tortuous. The male is about 14 inches long but the thick 
portion does not much exceed 4 inch, and is curved in a spiral. The 
