List of Illustrations. xxi 



PAGES 



Fig. 51. — Spirillnm, {Sjitrochcete) Obcnneicri. The spirilla among blood-cells in active movement. Those 

 marked * sketched a short time before the cessation of the fever. (After Weigert ; published 

 by Cohn.) 595 



52. — Spirillum (Spiroch/cte') plicatile. (After Cohn.) .......... 59,5 



53.— Spirilla in the blood of fever patients in Bombay. Traced from micro-photographs taken with 



Ross's xV' immersion objective. x 700 597 



54. — Beaded or rosary-chain appearance assumed by the spirilla found in the blood of a fever patient 



at Bombay (sketched as seen by Hartnack's immersion objective No. 9, ocular 4)- . . . 599 



55. — Flagellated organisms in the blood of healthy rats. x 700 605 



56. — Uiululina ranarum. (After Lankester.) 609 



57. — a, h, c, Changes undergone by a protozoon found in the blood of frogs in the course of a tew 



hours. X 500. (After Rattig.) . . 610 



58. — Protozoon obtained from the blood of a deer. (After Boyd Moss.) 611 



59. — Filaria from the blood of the Indian crow. x 500 ....... . . 613 



60. — Trichina cystica. Embryo of an oviparous nematode obtained in urine. (After Salisbury.) 



X 300 618 



61.- -Ova and freed embryos of an oviparous nematode ; obtained in urine. (After Cobbold.) . . 619 



62.— Embryos of a nematode helminth from a bird, obtained in the stomach of a mosquito. A few 



blood-corpuscles are included in the sketch, x 500 628 



63. — Various appearances presented by flagellated organisms in blood from a puppy's ear, seven to 



eight hours after it had been under the cover-glass. Two blood-corpuscles introduced, x lOOO 633 



64. — a—d Appearances presented by one of the flagellated organisms which had applied itself to a red 



blood-corpuscle, x 1000 634 



65. — Flagellated organisms from blood of a rat, preserved in a 0-75 per cent, solution of common salt. 



X 1000 636 



66.— Different methods of attachment to foreign bodies observed in the specimens of the organisms 



from blood of rat. The arrow indicates direction of progressive movement, x 1000 . . 637 



67. — Action of gentian-violet on specimens of the organisms from blood of rat. x 1000 . . . 637 



