\\2 TlMEHRI. 
wholly, of a thin liquid in which are contained cells, or 
corpuscles as they are then termed, comparable to the Pro- 
teus-animalcule, in which, however, no contra6lile vesicles 
have yet been discovered. These corpuscles — white-cor- 
puscles they are termed in contradistin6lion to coloured 
corpuscles, also found in the blood of back-boned animals 
— possess a nucleus, and the pseudopodial movement so 
charafteristic of Amoeba ', a movement in fa£t that has 
taken its name " amoeboid movement" from that type. In 
the blood of man, the coloured corpuscles which give the 
chara6leristic red colour, are much more numerous than 
the white corpuscles, and unless care be exercised when 
blood is examined under the microscope, only the 
coloured corpuscles will be noticed. 
Amxbx are to be found in stagnant water, in mud or 
even in moist earth. Unlike most Animalcules, they are 
not to be found free-swimming in the water, but creeping 
on the sides or bottom, attached to mud or decaying 
matter, in which they will frequently be observed when 
a little of this matter is gently scraped off and mounted 
for the microscope. 
Having now a fairly accurate idea of the strufture of 
this type, we will briefly review a few other forms of 
the Animalcules, a very large number of which are known 
to possess a still more simple strufture. 
Thus one form, which may be termed the Lower- 
amoeba [Protarnceba), differs in being destitute of a 
nucleus and a contra6lile vesicle, though similar in 
every other respe6l : its amoeboid movement, its changes of 
form and its method of feeding, are of the same kind as those 
of the Proteus-animalcule. This form thus presents the 
aspeft of a single speck of protoplasm without specialised 
