CARBOHYDRATES 147 
Polysaccharids. 
Starch (Amylum). 
Glycogen (Liver starch) 
Inulin 
Celluloses 
The following carbohydrates 
have an arbitrary formula 
corresponding nearly if not 
exactly to (CeHioOs), in 
which n may be different for 
the different forms. They 
are looked upon as composed 
of n molecules of monosac- 
charids with loss of some 
H,0. They are mostly little if 
at all soluble in water and are 
correspondingly lacking in 
sweetness. They are the com- 
monest forms of reserve car- 
bohydrates. 
Hydrolyzes ultimately to d- 
glucose. The commonest form 
of reserve carbohydrate for 
green plants. Always pro- 
duced in plastids (chloroplasts 
or leucoplasts). Usually 
formed in grains of alternating 
denser and less dense concen- 
tric layers. Occurs in many 
modifications (i.e. there are 
many starches). 
Hydrolyzes to d-glucose. 
Very’ abundant in fungi. Is 
the storage carbohydrate of 
animals also. 
Hydrolyzes to d-glucose. 
Stored in solution in roots and 
tubers of Asterales (e.g. Dah- 
lia). 
These are water-insoluble 
compounds which form the cell 
walls of most plants. Many 
forms have been distin- 
guished, differing in their solu- 
bility in weak acids and 
