CHALLE tT: 
THE CELL AS AN INDIVIDUAL. 
IF a small quantity of the green mould (Penzcillium glaucum) | 
which commonly appears on articles of food that have been 
kept for a few days, is examined ee 
under the microscope, it is found CARRIE eas 
to present somewhat the appear- 
ance of a minute tree(Fig. 1). The 
stem is simple, but bears at its 
summit: a number of branches 
resembling strings of beads. 
Each of these strings easily breaks 
up into its separate members ; 
and each of these members has 
the form of a tiny spherical blad- <A |: 
der with a delicate coat, enclosing == Y__} 
contents of a peculiar compo- eee : 
sition. All the branches and | 
the maim stem consist of similar 2 . Green mould, Peni 
betes dicing only; in. their... 2% gtaucum, (x abom 18) 
, iam.) 
greater length ; and these bodies 
are termed ce//s. In the example which we have chosen 
the individual cells are connected with one another 
only like beads on a necklace; but a close examination 
shows us that all parts of all plants are formed of cells, 
or are composed of structures which have themselves. 
been formed out of cells. Examples of this are furnished 
by the ripe but not too succulent flesh of fruits such as the 
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