xii LIST OF ILLUSTRATIONS 



FIG. NO. 



PAOE 



38. Alternative Modes of Division in Mycobacteria and Coryncbacteria ... 92 



39. The Cytology of Corynebacteria and Mycobacteria 93 



40. Branching in Bacteria 95 



41 I , , I 100 

 Maturation of the Spore .......... 



42. I I loi 



43. Life-Cycle of ATofrtr^Z/rt 104 



44. Nuclear Cycles in Bacteria .......... T05 



45. Maturation of the Microcyst in Brtrr. fo// . ....... 106 



The Cytology of Myxobacteria ' 



48. The Nuclear Reduction Process no 



49. Maturation of the Resting Cell in Brtff. ;//<;/i'(;f<'(7n/;// . . . . . .111 



50. Maturation of the Resting Cell in M. f///)tTn(/('5/5 112 



51. Life-Cycle in Af//;('»/y«'5 Bci'i.s- . . . . . . . .114 



52. Maturation of Resting Cell in 5/;//tT('/)/;('n(.s- . . . . . . .115 



^^■j Lifc-CvcleofCc»//()/wftT 



54.) ' I 123 



55. The L-Stage in the Bacterial Life-Cycle 126 



Bacterial Gonidia ............ 



S7-I I 130 



58. Life-Cycle of /l^oro/wf/er 131 



59. Myxobacterial Fruiting Bodies . . . . . . . . -135 



60. Stages in the Growth of a Medusa-head Colony . . . . . .138 



61. Growth of a Rough Colony .......... 139 



62. Smooth and Rough Colonies 140 



63. Colonies of Streptococci .......... 142 



64. Chlamydobacteria ............ 143 



65. Caulobacteria ............ 143 



66. Relationships of Cocci and Bacilh ......... 148 



67. Evolution of Flagella . . . . . . . . . . .152 



68. Diploid Forms of the Nucleus i$8 



