PART III.] Description of the Micro- Photographic Plates. 629 



PLATE XLI. 



Illustrating the developmental stages of organisms found in the blood of healthy animals shortly after 

 death : — 



Fig. J. — A tracing of bacilU from a micro-photograph. Magnified 1,100 diameters. 

 „ 2. — Growth of ditto into long filaments. Magnified 600 diameters. 

 „ 3.^ — Formation of " spores " in ditto. 

 „ 4.— The filaments having become nearly invisible, the " spores " only are seen, arranged linearly. 



Magnified 600 diameters. 

 „ ">,— Isolated " spores " in the condition sometimes described as " germinating." Magnified 1,000 



diameters (Fig. a, h, magnified 2,000 diameters). 

 „ 6 to 8.— The developmental stages of a bacillus helow the average dimensions. Magnified 1,000 



diameters. 

 „ 9. — ^Bacilli above the average dimensions. Magnified 1,000 diameters. 

 „ 10.- -Ditto showing growth into filaments. Magnified 1,000 diameters. 

 „ 11. — Ditto subsequently undergoing fission. Magnified 1,000 diameters. 



„ 12. — Spore-like bodies which formed In a portion of the filaments delineated at Fig. 10. Magnified 

 1,000 diameters. 



PLATE XLII. 



Illustrating the mature Filaria sanguinis-hominis, $ and $ , and some of the developmental stages of the 

 Embryos : — 



Pig. 1.— Anterior portion of mature helminth. Magnified 100 diameters. 

 „ 2. — Middle portion of parasite showing alimentary canal ; and the uterine tubules filled with ova. 



Magnified 100 diameters. 

 „ .3. — Ova and embryos. Magnified 300 diameters. 

 „ 4. — A portion of the male worm, with alimentary and sperm tubules escaping at one of the torn ends. 



Magnified 100 diameters. 

 „ 5. — Embryo recently ingested by a mosquito. Magnified 300 diameters. 

 Figs. 6 & 7. — Early changes undergone by the embryos in the mosquito. 

 Fig, 8.—? 

 „ 9. — More advanced stage of the development of the embryo. Magnified 300 diameters. 

 „ 10. — The " sausage-form " stage of development of the embryos. Magnified 300 diameters. 

 „ 11. — The embryos acquire more worm-like proportions. Magnified 100 diameters. 

 „ 12. — A still further advanced stage : the alimentary canal distinguishable. Magnified 100 



diameters. 

 „ 13. — Ditto : more highly magnified (300 diameters). The re-agent applied had caused the contents 

 of the caudal end to contract. 



PLATE XLIIL 



Micro-photographs of various organisms in the blood : — 



Fig. 1. — Flagellated organisms in the blood of healthy rats. A thin layer of blood, having been spread 

 over a cover-glass, was exposed to the fumes of osmic acid and subsequently mounted as a 

 dry preparation in the ordinary manner. It was then photographed as seen under a Ross's ^^" 

 immersion objective. ( Vide Part II, A.) Magnified 700 diameters. 



Fig, 2, — A preparation of the same blood as in Fig. 1. Instead, however, of exposing it to the influence 

 of osmic acid, it was allowed to dry spontaneously. When dry the preparation was stained 

 by means of a weak solution of aniline-blue and photographal as seen under a y\j" objective. 

 ( Vide Part II, A.) Magnified 700 diameters. 



Figs. 3 & 4. — Spirilla in the blood of fever-patients at Bombay — two micro-photographs of osmic acid 

 preparations, mounted dry. Many of the red blood-corpuscles are seen to present irregular 

 margins in both figures. A white amoeboid corpuscle is visible towards the upper edge of 

 Fig. 4. ( Vide Part I, G.) Magnified 700 diameters. 



Fig. 5. — Anterior portion of the mature Filaria sanguiniH-liominis, photographed under a Ross's 3" object 

 glass. The width of the worm is slightly increased owing to the pressure exerted by the 

 cover-glass. ( Vide Part II, B.) Magnified 25 diameters. 



