Text Appearing Before Image: e mononuclear cells of the guinea-pigs blood. These lymphocytozoa have an intracorpuscular stage, andultimately give rise to free-swimming, spirochaete-like bodies, whichmay be gametes. The development of the spirochaete-like body is demonstrated. The name Lymphocytozoon cobayae is suggested for thisparasite. REFERENCES Burnett (1904). Journ. Med. Research. Ehrlich (1906). Quoted by Ledingham, Lancet, London, June 16. GoLDBORN (1905). New York Path. Soc. Prcc. HiNDLE (1911)- Parasitology, voL 4, No. 4. Howard (1907). Journ. Med. Research. Hunter (1909). Univ. Penn. Med. BulL, Phila., vol. 22. KuRLOFF (1891). Ehrlichs Die Anaemic. Ledingham (1906). Lancet, London, June 16. Pappenheim (1908). Folia Haematologica. Patella (1908). Berliner klin. Woch. Ross, H. C. (1909). Roy. Soc. Prcc, B, vol. 81, p. 97. Schilling (1911). Centralb. f. Bakt., orig., vol. 58, Part 4. Staubli (1905). Deut. Archiv f. klin. Med. 1(> PLATE VILymphocytozoon cobayae.For Explanation of Plate see text. PLATE VI Text Appearing After Image: 17. Mss r.. Baxry- dsl a,3. na,t 18. 19 Lli-tta,Jj itK^ X ohI on. DEVELOPMENT OF A LEU COCYTQZOON OF GUINEA-PIGS. (From PAEASITOLOGY, Vol. IV. No. 2, Jult 18, 1911)(All Rights reserved) 94 ^^?^) AN IRON-HAEMATEIN STAIN. WITH KEMARKS ON THE GIEMSA STAIN.By HARALD SEIDELIN, M.D. ^ (From the Lister Institute, Zoological Department.) Plate V. For general purposes, especially in haematological work, the Giemsamethod, based on the Romanowsky principle, is certainly the mostsatisfactory stain for Protozoa. For certain structures, however, and ingeneral as a control of the Giemsa stain, it is always necessary to haveat ones disposal another method which will give particularly clearpictures of the nuclear elements (sec e.g. Minchiu, 1909). Of thedifferent methods which are employed for this object the iron-haematoxylin stain is probably the most valuable and the mostfrequently used. There are, however, several circumstances which areunfavourable to its use as a universal stain. Its principal d
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