1910.] THE BLOOD OF GROUSE. 731 



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2 pis. 

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disease among young Grouse." Proc. Zool. iSoc. Loud. 1910, 



pp. 672-691, V pis. 

 Fantham, H. B. (1910). — " 01)servations on the Parasitic Proto- 

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Lond. 1910, pp. 692-708, 3 pis. 

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Oo3cidiosis." Proc. Zool. Soc. Lond. 1910, pp. 708-722, 



1 pi. 

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& 13th Ann. Kept. Bureau Anim. Industry, U.S. Dept. 



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Red Grouse {Lagopus scoticus).'" Proc. Zool. Soe. Lond. 



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EXPLANATION OF PLATE LXIII. 



All figures \yei-e outlined with Abbe-Zeiss camera lucida, usins^ Zeiss 2 mm. 

 apochromatic immersion objective and compensating ocular 12. Prejiarations 

 stained with Jenner's stain. 



The magnification is in all cases approximately 2000 diameters. 



Fig. 1. Erj'throejte of Grouse. 



2. Krj'throcyte of Pigeon. 



3. Erytliroc.N te of Fowl. 



4. Thrombocyte of Grouse. 



5. 6. Lymphocytes of Grouse. 

 7, 8. Mononuclears of Grouse. 



9. Mononuclear leucocyte of Grou-^e showing vacuolations internally. 

 Prom a bird sufiering from slight spirocliajtosis. 



10-12. Polymorphonuclears (Hurnett) or crystalloid eo.sinophile cells 

 (Cullen) ot Grouse. In fig. 10 the cytoplasmic enclosures are rod- 

 like, in fig. 11 they are spindle-shaped bodies, while in fig. 12 the 

 spindle bcdies have .small clear cential aieas. 



13-15. Eosinophile leucocytes of Grou.?e (coarsely granular eosinophile.s 

 of Cullen). Tlie figures represent the variation in the size and shape 

 of the eosinophile granules. Figs. 13, 15 represent the commonest 

 forms of eosinophiles. 



16, 17. Mast cells (l)asophiles) of Grouse, showing metachromatic basophile 

 graimles in cytoplasm. 



18. Elongate tailed cell occurring iu the blood of a Fowl chick. The chick 

 was suffering from coccidio.sis. Some authors consider such spindle- 

 .shaped or tailed cells to be normal to the blood of birds and reptiles. 

 E.xtremely few such cells occur in the blood of normal Grouse. 



