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United States Army Veterinary Service
Use of Lythima in Veterinary Practice......
Use of Mallein for the Diagnosis of Glanders in Horses, and Experiments with
Walley, Thomas, M.R.C.V.S., Malpositions of the Colon.....
Webster, R. G., V.M.D., Abortion...
Western Iowa Veterinary Medical Association
Williams, Charles, V.M.D., Quittor or Quitter.
Williams, W. L., V.S., Actinomycosis in relation to Meat Inspection...
75 Various Stages in the Development of Coccidium Bigeminum..
76 Type Figure.....
77 Anterior Portion of Mermis Crassa.....
78 Mouth and Papillæ Highly Magnified.
79 Tail of Male Mermis Crassa Magnified
.. 188 .. 188
80 End of Spicule, Showing Evaginated Canal..
81 Diagramatic Representation of the Phases of the Development of the
a, capsule; b, longitudinal line or rib; c, anterior teeth; d, an
terior cilia; e, papillæ; ƒ, posterior papillary bodies or plates;
g, anterior armed pharyngeal ring; h, pharyngeal capsule; k, anterior constricted portion of œsophagus; /, posterior ventricle or bulb.
a, anterior teeth; d, anterior cilia.
b, longitudinal line or rib; ƒ, posterior plates.
Fine anterior teeth.
a, caudal pouch of male; b, spicula.
Posterior moiety of female; b, anus.
Undeveloped or agamous worm, in thin transparent membrane, which is shed on reaching maturity.
Fig. XII. Fig. XIII. Male and female worms natural size, as attached during copulation. 86 Sclerostoma Equinum....... .......608c Caudal extremity of the male Sclerostoma equinum. (Neumann.) Fragments of the cæcum of a horse, showing the tumors of differ
ent sizes due to the sclerostomes, as well as parasites fixed on the mucous membranes. (Neumann.)
87 Fig. I.
Verminous aneurism of the great mesentric artery; one-half natural size. (Railliet.)...........
88 Rheumatism in Horses.
a, Protrusion of Os Calcis....
b, Fiber of Gastrocnemius Externus..
89 Depression on Articular Surface of Patella...
90 a, Depression caused by Absorption of Articular Cartilage.... b, Rupture of Popliteus from its Origin........
c, Elevation and Depression the Result of Deposition...
91 b, Absorption of Cartilage........
b, Rupture of Origin of Popliteus Containing Particles of Bone..
a, Denuded Bone Showing Result of Absorption of Cartilage.....
Abdominal aorta of a horse with its ramifications. (Neumann.)
BY COOPER CURTICE, M. D., VETERINARIAN,
In the July number of the last volume I described how the young tick hatching from the so-called egg, passed through a sixlegged and an asexual eight-legged stage to again moult before emerging as adult ticks.
The differences between the ticks destined to become either male or female during their final moult is not marked. The average of the males is smaller, but a small female may not be any larger than an ordinary male. In each the mouth ring and mouth parts, the shield-like head-piece, the breathing pores, the limbs and the body are alike.
After they emerge, however, the males can be quickly chosen by their smaller size, by the absence of a well-defined head shield, by the extension of the shield over entire back, and by the two pairs of triangular chitinous plates, situated on the abdomen, behind and on each side of the anus. The female looks much as in her earlier stage; the head shield is, however, larger and stronger, the lines made by the muscular attachments to the body-walls are stronger and deeper, and the breathing pores are much enlarged. The limbs, in both male and female, are strong and large as com-. pared with their bodies, and fit them for retaining their place on their host until they have gained a new attachment by their mouth or rostrum. The external genitals which appear in the adults are very similar in each sex, and occur between the bases of the second pair of legs. They present little more than an opening situated on the middle line of the belly.
Throughout life the male enlarges but little; he becomes a little broader, longer and thicker, but not markedly so. The female,