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Proceedinys of the Royal Physical Society. 



seen joined by an irregular arrangement of red staining 

 strands. The resting state before division is illustrated 

 by Fig. 4. 



Fig. 43a. Eather later stage. Xote the development of the mitotic fibre 

 apparatus, and tbe pushing apart of the two halves of the 

 nucleus. This figure illustrates the division of the kineto- 

 nucleus. I am not quite clear about the red strand parsing 

 back from the kinetonucleus to the posterior edge of the 

 protoplasm, but think it has to do, very probably, with the 

 basal granule. 



Figs. 44, 44a, and 45. Further stages of division. 



Fig. 46 shows the middle stage of division; the fibres are beginning to 

 narrow down at the centre. 



Fig. 47 shows the bar of fibres joining the two reconstracted tropho- 

 nuclei ; it will be seen that this bar is connected apparently 

 with the "membrane" of the nucleus. The preflagellar 

 bodies, and their connection with the kinetonuclei, are well 

 shown in this figure. 



Fig. 48 shows the bar of mitotic fibres joining the nuclei, although the 

 protoplasm is already divided. 



Fig. 49 shows precocious division of the two tropho nuclei before the 

 protoplasm is di^dded. 



Fig, 50. Individual, with four troj)honuclei and two kinetonuclei. 



Fig. 51. Division into four. 



Fig. 52. Division into three. 



Fig. 53. Division into three; here the trophonuclei have divided, but the 

 kinetonucleus is not vet divided. 



Fig. 54. Late stage of division of the trypanosome. This shows the 

 division of the basal granule. 



Fig. 55. Late stage of division. Xote the difiference between the two 

 daughter individuals and the position of the trophonuclei 

 and kinetonuclei. 



Fig. 56. Note alternate position of the trophonuclei and the kinetonuclei. 



Fig. 57. Product of such a division as that shown in Fig. 56. 



Fig. 58. Division in which one of the individuals is markedly broader than 

 the other, the nucleus of the broad individual is sliorhtlv 

 disorganised: this is a iDurelv accidental occurrence, 



Fig. 59. Unequal division. Xote the difference in appearance of the two 

 trophonuclei. 



Figs, 60-62. Small persistent forms, which seem capable of surviving 

 through a period of hunger, and reinfecting the leech. 



Fig. 63. Young trypanosome developed fi-om these small forms. 



