422 SECOND PART.—MYCETOZOA. 
without success. Germination takes place under conditions which will be more 
particularly related in a subsequent page; in most species when the spores are 
placed in water. 
The germinating spore (Fig. 182) swells first of all by absorption of water, and 
one or two small vacuoles, which disappear and reappear alternately, are seen near the 
upper surface of the protoplasm in which rotating movements are often observed ; at 
length, and usually 12-24 hours after the scattering of the spores, the membrane 
bursts and the protoplasm oozes or creeps slowly out of the opening. The 
protoplasmic body then either at once, as is the rule, or after a transitory period of“ 
rest, during which it assumes a spherical form, commences amoeboid movements, 
undulating changes of outline and protrusions and withdrawals of pointed processes, 
and in this way becomes elongated into a body which moves about in the water like 
a swarm-spore and is known by the name of swarm-cell (Fig. 182 d-f). 
The swarm-cell has the same structure as the protoplasmic body before it 
emerged from the spore, only that the granules in the protoplasm are collected together 
in the larger part of the cell, which is the 
hinder part in the movement, while the anterior 
part is free from granules and also contains 
the nucleus. From one to three vacuoles lie 
in the posterior part, one of which at least 
is known as the contractile vesicle, because 
in about a minute’s time it grows smaller and 
disappears, and then reappears and enlarges 
till it is one third or one half the breadth 
of the protoplasmic body. The granules or 
lumps of mucilage in the spore either continue 
in the swarm-cell, or they are dissolved before 
the protoplasm leaves the spore, or they are 
weaning eazia Spores in water. (a before extruded and left behind within the membrane. 
ruptured spore-membrane. e an older swarm.cell with 
cia. fan amoeboid swarm-cell without cilia, The ine Ihe Swarm-cell has no firm membrane, but 
193 bare omitted inthe drawing. Magna ame “careful observation shows that it is surrounded 
by a tolerably broad, pellucid and indistinctly 
defined envelope of the consistence of mucilage. 
The movements of the swarm-cells are of two kinds: a Aoppimg and an 
amoeboid creeping movement. 
In the hopping movement the cell floats freely about the water with its anterior 
extremity usually turned upwards. This extremity is finely pointed, the point being 
drawn out into a long cilium or flagellum with an undulating and swinging movement; 
in exceptional cases only there are two cilia. The posterior extremity is usually broad 
and rounded off, and the presence of a cilium there is quite abnormal. The body 
thus constituted rotates round its longitudinal axis in the circumference of a cone the 
apex of which is formed by the posterior extremity. The cilium swings with an 
undulating motion from side to side, making the swarm-cell move in a similar manner 
and advance in one direction; sometimes there is no rotation, The body at the 
same time exhibits constantly varying undulatory movements of its surface, with bending 
and contraction and recurrent expansion of the parts. 

