XX List of Illustrations. 



PAGES 



Fig. 25. — As Fig. 24, but the " receptaculum " split open, the rugte of the coiled-up neck brought to view, as 



well as the orifice by which the parasite eventually escapes, x 5 495 



„ 26. — The " head " and " neck " pulled out of the " receptaculum " through the rent, x 5 . . . 496 



„ 27. — As Fig. 26, with the neck everted and uncoiled. The head is still inverted, x 5 . . . 496 



,, 28. — The " head " having been everted a hair was introduced through the orifice, fastened to the 

 "neck," and the parasite withdrawn from the "receptaculum." The latter is seen to be con- 

 tinuous with the " neck " itself . X 5 497 



„ 29. — The worm completely withdrawn from its enveloping vesicle, x 5 . . . . . . 497 



„ 30. — Diagrammatic section, showing the inverted and coiled condition of the " head " and " neck " with 



the relation of the latter to the receptaculum '. 498 



„ 31. — Living HEematozoa observed in a single preparation of blood obtained by pricking (with a needle) 

  the finger of a European woman suffering from chyluria. A few red corpuscles have been 



introduced to show the relative size of the filaria. x 300 509 



„ 32.— Hsematozoa as in Fig. 31, after the addition of preservative media, x 300 514 



„ 33. — Various appearances presented by a single hasmatozoon, as observed under a ^" immersion 



object-glass, x 600 516 



. „ 34. — The canine hsematozoon and three red blood corpuscles fixed in serum by osmic acid. The clear 

 space alongside the parasite is owing to the removal of the film of serum by contraction of the 

 worm. X 600 538 



^^ 35. — Echinorhynchus from the walls of the stomach of a pariah dog 541 



„ 36. — Development of organisms in human blood. (Hartnack's Ocular 3, Objective 7.) (After Osier.) 561 



„ 37. — Various forms of fission-fungi — Schizomycetcs. x 600 566 



„ 38. — BacilluH antliraeis obtained, after death, in the blood of an ox which had died of splenic disease. 



(After Cohn.) x 600 571 



,, 39. — liacilhis anthracis from the blood of a guinea-pig. Translucent bacillus-rods undergoing 



segmentation. Blood-corpuscles scattered throughout the field. (After Koch.) x 650 . . 573 



,, 40. — Bacilltut antki-aclfi from the spleen of a mouse after a 3-hour "cultivation" in a drop of aqueous 



humour. (After Koch.) x 650 573 



^^ 41. — JiariUus anthrardx : Germination of the spores. (After Koch.) x 650 574 



„ 42. — Bacillus anthracis : Germination of the spores. (After Cohn.) x 1,650 574 



„ 43. — Bacillus anthracis: Rods undergoing segmentation and lengthening into a filament. (After 



Ewart.) X ? diam 575 



„ 44, — Bacillus anthracis : Spore containing filaments ; their development. (After Ewart.) . . . 575 



^^ i^.— Bacillus anthracis: A sporule developing into a rod. (After Ewart. ) x ? diam. . . . 575 



^j 46. — The Bacillus of infectious Pnevmo-enteritis of the pig, cultivated in aqueous humour of rabbit, 



showing spores germinating into rods, isolated rods, and series of rods 583 



47. — From a similar specimen, as in Fig. 46, at a later stage ; most of the rods have grown into long 



filaments ......•• 683 



48. — Showing formation of bright cylindrical spores in the filaments at a later stage. These drawings 

 (Figs. 46, 47, and 48) are represented as the objects appear when seen under a Zeiss's F. 

 objective, and Hartnack's III. eye-piece, fitted to a Hartnack's small stand. (After Klein.) . 583 



49. Bacillus subtilis : formed on the surface of a boiled infusion of hay which had stood 24 to 48 



hours. (After Cohn.) x 600 587 



50, Organisms found in the tissues of //m^^/ty animals a few hours «Aer death, x 1,500 . . . 588 



