4 1 8 CHEMISTR Y OF THE DIGESTIVE PROCESSES. 
cleavage or any other theory, save in the names of such of the substances 
as have been named on a theoretical basis : — 
Peptic Digestion. Tryptic Digestion. 
Proteid. Protcid. 
I I 
Acid Albumin Alkali Albumin 
Deutevoalbumose 
Protoalbumose Heteroalbumose 
\ / Antipeptone, amido-acids, etc. 
Deuteroalbumose 
I 
Amphopeptone . 
In the above account of the intermediate products formed between 
proteid and peptone, an attempt has been made to point out how far 
each important experimental result is in agreement with, or lends support 
to, the cleavage theory of proteid digestion. Most of the results have 
been obtained by supporters of that theory, but these results fall far 
short of proving the truth of the theory, and may be explained without 
reference to anti- and hemi-bodies. The mam points may here be 
summarised : — 
1. Certain substances have been obtained by the action of dilute acid-; on 
proteids, which do not yield amido-acids when subjected to prolonged tryptic 
digestion ; these substances have been on this account looked upon as pure 
anti-compounds. But there is no evidence that such substances are formed 
naturally in either peptic or tryptic digestion : there is evidence against it in 
the extreme difficulty with which they are attacked either by pepsin or 
trypsin. Neither are these substances in their chemical behaviour albumoses, 
so that the term antialbumose, as applied to any of them, is a misnomer. 
2. The substance originally obtained from a fractionated peptic digestion, 
and named hemialbumose, was afterwards shown by its discoverers to be a 
mixture of three bodies, — protoalbumose, heteroalbumose, and deuteroalbumose, 
— and none of these three discrete bodies was found to be either a pure hemi- 
albumose or pure antialbumose, so that, if the cleavage theory is to be main- 
tained, we must be content to believe that each of these three is a mixture 
in varying proportions of anti- and hemi-groups, and admit the existence of 
antiprotoalbumose and hemiprotoalbumose, of antiheteroalbumose and hemi- 
heteroalbumose, of antideuteroalbumose and hemideuteroalbumose, without 
any experimental evidence whatever. Again, the cleavage theory takes no 
account of the fact that proto- and //'-/Vroalbumose are formed prior to the 
deuteroalbumose. 
3. Amphopeptone is supposed to be a mixture in about equal proportions 
of antipeptone and hemipeptone ; but these two bodies have never been isolated 
from it. Antipeptone can only be obtained from amphopeptone by the action 
of trypsin, and hemipeptone has never been obtained at all. 
4. There is no doubt that some forms of proteids, or altered proteids, are 
more easily decomposed by trypsin, yielding amido-acids, than are others ; but 
this does not prove that such bodies are variable mixtures of a fraction which 
is not decomposable at all with one which is completely decomposable. When 
from an ampho-body there have been isolated two fractions, one a pure anti- 
body that is completely unalterable by trypsin, the other a pure hemi-body 
that is completely decomposable into amido-acids by trypsin, then it will be 
time to believe in ampho-, anti-, and hemi-bodies. At present neither from 
amphopeptone, protoalbumose, heteroalbumose, or deuteroalbumose has there 
