6 ILLUSTRATIONS. 



Page. 



Plate XL. Actinomycosis of the jaw 450 



XLI. Actinomycosis of the lungs 450 



XLII. Section of muscle from a blackleg swelling 464 



XLIII. Necrotic stomatitis (calf diphtheria) 464 



XLIV. Normal spleen and spleen affected by Texas fever 504 



XLV. Texas fever 504 



XLVI. The cattle tick ( Margaropics annulatus), the carrier of Texas fever. . 504 



XLVII. The cattle tick ( Margaropus annulatus) 504 



XLVIII. Portion of a steer's hide showing the Texas fever tick (Margaropm 



annulatus) 504 



XLIX. Fig. 1.— Tick-infested steer. Fig, 2.— Dipping cattle to kill ticks. 504 



L. Facsimile of poster comparing ticky and tick-free cattle 504 



TEXT FIGURES. 



Fig. 1. Homily (Hsematobia serrata) in resting position 504 



2. Hornfiies {Hsematobia serrata) on cow horn 505 



3. Buffalo gnat 506 



4. Screw worm (larva of Chrysomyia macellaria) 506 



5. Screw-worm fly ( Chrysomyia macellaria) 507 



6. The warble fly {Hypoderma lineata) 508 



7. Short-nosed blue louse {Hsematopinus eurysternus) of cattle 512 



8. Long-nosed blue louse {Hxmatopinu^ vituli) of cattle 512 



9. Red louse ( Trichodectes scalaris) of cattle 513 



10. Egg of short-nosed blue louse {Hsematopinus eurysternus) attached to a 



hair 513 



11. Mite which causes psoroptic scab of sheep 514 



12. Portion of the wall of the first stomach with conical flukes {Paramphis- 



tomum cervi) attached 519 



13. Twisted stomach worms {Hxmonchus contortus) 519 



14. Twisted stomach worms {Hsemonchus contortus) enlarged 520 



15. Embryo of twisted stomach worm (Hsemonchtis contortus) coiled on tip 



of grass blade 521 



16. A drenching tube made fi-om an ordinary tin funnel, a piece of rubber 



hose, and a piece of brass pipe 522 



17. Piece of lining of foiu-th stomach showing cysts of the encysted stomach 



worm {Ostertatia ostertagi) 523 



18. A tapeworm {Moniezia planissima) which infests cattle 524 



19. The common liver fluke (Fasciola hepatica) 526 



20. The large American fluke {Fasciola magna) 526 



21. Portion of grass stalk bearing three encysted cercaiise of the common 



liver fluke {Fasciola hepatica) 527 



22. Hydatids {Echinococcus granulosus) in portion of hog's liver 528 



23. Thin-necked bladder worm ( Taenia hydatigena) from abdominal cavity 



of a steer 529 



24. Lung worms {Dictyocaulus viviparus) of cattle 530 



