10 PHARMACEUTICAL BOTANY 
Other plant organs are also differentiated into secondary 
parts or tissues which have been set aside to perform some definite 
kind of work in the economy of the organs. The healthful 
performance of the functions of an organ depends upon the har- 
monious relation existing between the tissues of which it is 
composed. 
Chondriosomes 
¢ 
2 aN past 
x en" 
sat Te 
+ 
Pon tapas 
Cyloplasm--~ 22, shh 
Nuclear 5 rhea “oe 
Membrane ~~ = ig —Plastids 
a s 
- x # 
Nucleolus- DSc} ——-Linin 
eg 7 Chromatin 
4 * 
Ps 
oa sia a 
“ai ~-*Chondriosomes 
Fic. 4.—Sections of fixed and stained cells from the root tip of the garden pea 
(Pisum sativum). A, young cell before appearance of vacuoles. 8B, older cell with 
vacuoles. (Mottier.) 
Every tissue, when examined microscopically, is seen to be 
composed of numerous units of similar form which are in intimate 
relation one with another. ‘These appear like small compart- 
ments or chambers, separated from each other by walls and have 
been termed Cretis. It will be noted that every cell possesses 
contents. 
While these cell contents vary in character depending upon 
the cell examined, every living cell contains a viscid, often gran- 
ular, reticular or alveolar, mobile, or jelly-like substance in 
which life resides. This is called Prorop.asm or living matter. 
It is this living substance which constructs the celis or funda- 
