174 On the Development of Vaucheria Resting-spores. 
animal organisms, even though they have taken origin from 
the substance of the plant. 
EXPLANATION OF PLATE XIV. 
Fig. 1. A. Anordinary decoloured Vaucheria resting-spore. 
B. A resting-spore of V. racemosa with many pigment-heaps and 
the substance generally composed of fine granules. 
C. A spore very much like the last, but in which vesicles seem 
beginning to form again from the granular substance. 
D. Another spore, in which the new vesicles are small and dis- 
tinct, but colourless. ; 
E. A spore almost ready to germinate, in which the small vesicles 
have taken on a pale green colour and the pigment-mass 
has become more defined in outline. 
All X 250. 
Fig. 2. A. A spore which has germinated lined with small chlorophyll- 
corpuscles and containing a single pigment-organism. 
B. A spore with two pigment-organisms and scarcely any chloro- 
phyll-corpuscles. 
C. A spore with three pigment-organisms making their way out 
into the filament. 
D. A spore and filament, showing a large pigment-organism in 
the latter compressed into an ovoid shape. 
E, Another germinated spore, showing a large and two small 
pigment-organisms far out into the filament and com- 
pressing one another, one being flattened against the upper 
border of the filament. 
A, B, C, D, x 250; E, x 125. 
Fig. 8. A. Aspore thickly lined with chlorophyll-corpuscles and con- 
taining four unequal pigment-organisms. 
B. The same spore, more highly magnified, after an interval of 
fifteen minutes, in order to show indications of the move- 
ments of the organisms during the interval, during the 
period when this photograph was being taken, or during 
both these periods. 
C. A large pigment-organism, far out in a filament well lined 
with chlorophyll-corpuscles, after it had been killed by a 
solution of formalin. 
D. A more developed pigment-organism within an old spore, 
which, as well as the filament, was devoid of chlorophyll- 
corpuscles. 
E. One of the pigment-organisms which has become encysted 
outside a filament. 
A, X 125; B, x 250; ©, x 375; D, * 250; EH, x 500. 
Fig. 4. A. Two pigment Amebe in an otherwise empty filament, with a 
distinct margin of brownish protoplasm, showing some 
indications of approaching segmentation. 
B. One of the Amcebe in which peripheral segmentation into 
monads has taken place. 
C & D. Two pigment Amebde in which a central nuclear mass of 
protoplasm has been formed. 
EB. An old resting-spore, containing a pigment Amada in which 
there is an abortive attempt at the formation of a similar 
nuclear mass of protoplasm. 
All x 375, 
