ORGANIZATION. 
39 
ber” of whales), between the mnscles (as in “streaky” 
meat), or in the abdominal cavity, in the omentum, mes¬ 
entery, or about the kidneys. The marrow of bones is an 
example. Globules of fat occur in many Molluscs and 
Insects; but true adipose tissue is found only in back¬ 
boned animals, particularly the herbivorous. In the aver¬ 
age Man, it constitutes about part of his weight, and a 
single Whale has yielded 120 tons of oil. The fat of 
animals has the different names of oil, lard, tallow, suet, 
spermaceti, etc. It is a reserve of nutriment in excess of 
consumption, serving also as a packing material, and as 
a protection against cold. 
<7) Muscular Tissue. —If we examine a piece of lean meat, 
we find it is made up of a number of fasciculi, or bundles 
of fibres, placed side by 
side, and bound together 
by connective tissue. The 
microscope informs us 
that each fibre is itself a 
bundle of smaller fibres; 
and when one of these is 
more closely examined, it 
is found to be enclosed in 
a delicate, smooth tube, 
called the sarcolemma. 
This tube is filled with 
very minute, parallel 
fibrils, averaging T^nhnr 
of an inch in diameter, and having a striated aspect. 
Tissue of this description constitutes all ordinary muscle, 
or “ lean meat,” and is marked by regular cross-lines, or 
strice. 
Besides this striated muscular tissue, there exist, in the 
coats of the stomach, intestines, blood-vessels, and some oth¬ 
er parts of Vertebrates, smooth muscular fibres, or mem* 
Fig. 11.— Striated Muscular Fibre (of the Pig), 
X 200. The constituent fibres are seen at a; 
c is a fasciculus, or bundle. 
