SPIROCHATA BALBIANIL AND SPIROCHMTA ANODONTA. 37 
between, these points as nodes. Such transverse division 
into many segments does not occur, and the organism is a 
unicellular Protist. But one can usually focus down to these 
bars, and then below through a granular endoplasm, in 
favourably stained specimens under the best conditions 
of illumination. Also, the rod-like character of the chromatin 
is shown in transverse sections (vide text-fig. 6). 
Again, there is, undoubtedly, a spiral, achromatic, con- 
necting thread more or less evident at different periods of 
the life of the organism, which seems to me to be not easily 
.Y x 
- ‘ Le 
a : . 
: ; 
: 
\ . 
a 
Trxt-Fic. 9.—This shows the nuclear helix in Spirochetes, and 
its various forms and correlations: @. Loose helix, with chromatin 
masses at the turns, connected together chiefly by achromatic sub- 
stance. This stage is seen during the activity of the organism. 
6 shows scalariform rodlets with slight amount of achromatic sub- 
stance. c shows rodlets, some thicker than others because they 
were originally arranged on a helix, and so were at different depths 
of focus. d shows division of the rodlets into dumb-bell shaped 
chromatin masses. e shows longitudinal division of the organism. 
The halves of the dumb- bell shaped chromatin masses are contracting 
to the periphery—the remains of the threads are ‘ looping-up.” 
compatible with the idea of discs (PI. 1, figs. 5, 11; Pl. 2, 
figs. 13, 15, 16, 27). 
Returning now to the rodlets seen in the normal form, if 
one looks carefully at such rodlets one finds certain irregu- 
larities as depicted in text-fig. 9, such as some bars being 
thicker than others, some thicker at one end and yet others 
broken into dots. 
In other forms the transverse rodlets are united by faintly 
