120 C. CLIFFORD DOBELL. 
PLATE 5. 
All drawings are made from permanent preparations, stained Heidenhain’s 
iron hematoxylin. Fixation: Fig. 41, osmic vapour; remainder, sublimate 
alcohol. Figs. 34-40 drawn under a 2mm. apochromatic oil-immersion 
(apert. 1:40), compensating ocular 12. The others under the 3 mm. apochro- 
matic, compensating ocular 18. 
Fics. 34-40.—Nuclear division. 
Fic. 34.—Nucleus before division. 
Fic, 35.—First stage in division; somewhat fusiform; chromatin granules 
extruded at opposite poles. 
Fic. 36.—Nucleus now in the form of a short rod. 
Fic. 37.—Nucleus dumb-bell shaped. 
Fie. 38.—Chromatin aggregating at the ends of the dumb-bell, so as to give 
rise to two daughter-nuclei connected by a broad band. 
Fie. 89.—Daughter-nuclei still connected by a filament. 
Fic. 40.—T wo fully-formed daughter-nuclei. 
Fries. 41-46.—Flagellum and its method of multiplication. The drawings 
are of the anterior end of the organism. 
Fig. 41.—Ordinary individual before division, showing basal granule, etc. 
Fig. 42.—Flagellum being drawn in. 
Fie, 43.—Flagellum completely drawn in, only basal granule left. 
Fie. 44.—Division of basal granule. The daughter granules lie one on 
either side of the reservoir, and are still connected. 
Fie. 45.—Growth of new flagella from the basal granules. ‘The latter are 
still seen to be connected by a fine filament. 
Fic. 46.—Later stage. The flagella are longer, and are seen growing out 
of the depressions caused by the formation of the new cell-mouths. The 
reservoir is cleft in two. 
Fia. 47.—Abnormal union of three monads. 
Fic. 48.—Copromonas sp. from the feces of the newt. 
