8 
in vegetable foods that are digested, and require digestion, prior 
to their assimilation), are converted into the products indicated 
in the appended summary 
f He +H: 
Starch — dextrins — maltose — glucose (monosaccharid) 
+ H:O 
Cane sugar — glucose and fructose (monosaccharids) 
+20 , glycerol 
Fats —3< ’ 
fatty acids (soaps) 
+ H:0 +H H:0 
Proteins — proteoses > peptones > amino acids 
Monosaccharids io _ aie fructose), glycerol and is 
(soaps), and amino acids the ‘‘end products of dige 
” These ss em of Gee from) the digestible 
ae substances are absorbable and assimilable, whereas most of 
the compounds from which they are produced nil digestion are 
neither and, without digestion, are non-nutritio 
Alimentary digestion results, in brief, in es conversion of a 
very large number of dissimilar complex ‘‘foreign’’ compounds 
into a few simple ‘‘native’’ substances. The digestive products 
in animals are comparable to the common mineral nutrients for 
plants—they are the construction units with which all the building 
and rebuilding in animals are accomplished 
Ill ‘end products of digestion,” which the animal cells 
cannot produce from inorganic matter, are synthesized in great 
bundance, in plants, from carbon dioxid, water, and mineral 
substances such as nitrates, and then are condensed into carbo- 
hydrates, lipins, proteins and many other substances. Thus, tl 
production of sie in planes may be indicated by the follow. 
ing abbreviated equati 
6CO2 6H:O0 —= CsH 206 + 602 
Carbon dioxid Water Glucose Oxygen 
The condensation of glucose into starch, in plants, is suggested 
by the appended equation 
nCgHwOs — 2H2O = (CoHi0Os)n. 
