CONTRinU'l'lONS TO THE CYTOLOGY OF THE BACTElv'TA. 50 1 



Fig. 28.- — Four-cell stage. Euch cell contains a nnclens and a retrac- 

 tile granule. 



Fig. 29. — Four-cell stage. The lower right-hand cell contains a 

 single resting nucleus. The three other cells contain dividing nuclei. 

 The upper left-hand cell contains two small refractile granules — the 

 three others one. 



Figs. 30-40. — Large Bacilli of sx^ii'^J^'yi"'"^ type from large intestine of 

 Mabuia carinata. (I jjer cent, osmic acid, drop method; 

 Leishman's stain.) 



Fig. 30. — Long Bacillus, with nucleus in the form of a spiral or zig- 

 zag filament. 



Fig. 31. — A similar form to the preceding. l»ut with a longer and 

 more twisted nucleus. 



Fig. 32. — Similar form, showing two loops in the nuclear filament. 



Fig. 33. — Similar organism just completing division into two. 



Fig. 34. — Shorter individual, with typical spirogyra type of nucleus. 



Fig. CO. — Simihir form wnth nucleus in the form of a straighter, 

 varicose filament. 



Fig. 36. — Short Bacillus, with nucleus clearly seen to he comjDosed of 

 chromatin granules, aggregated to form a spiral or zig-zag filament. 



Fig. 37. — Bacillus containing finely granular cytoplasm and six 

 large nuclear graniiles. Possibly a degenerate or developmental form 

 of tlie preceding organisms. 



Fig. 38.— Bacillus with nucleus in the form of a liroken spii-al fila- 

 ment. Degenerate or developmental form ? 



Fig. 30. — Spore-bearing individual of spirogyra type. 



Fig. 40. — Degeneration form. 



Fig. 41. — Long, slender Bacillus from large intestine of Malniia 

 carinata. JSucleus of chromidial type. (1 per cent, osniic acid, drop 

 method ; Leishmau's stain.) 



Figs. 42-44. — Micrococci from large intestine of Mabuia carinata. 

 (1 per cent, osmic acid, drop method ; Leishman"s stain.) 

 Fig. 42. — Diplococcus form — each cell with a single nucleus. 

 Fig. 43.— Coccus with nucleus in the form of a short zig-zag filament. 

 Fig. 44.— Typical Micrococcus, with single nuclear granule. 



PLATE 17. 



Figs. 45-60.— Various Bacteria from large intestine of Lacerta 

 muralis. (1 i^er cent, osmic acid, drop method ; Giemsa's stain.) 

 Fig. 45.— Group of five Micrococci of dift'erent sizes. The nucleus 

 is very obvious in each cell. 



