By the initial action of pepsin-acid, proteids are first transformed into acid-albumin or syntonin, then, by the further action of the ferment, this body is changed into the primary proteoses, proto and heteroproteose, of each of which there must be two varieties, a hemi and an anti. These may then undergo further transformation into what is known as a secondary proteose, viz., deuteroproteose, of which there must likewise be two varieties, corresponding to the hemi- and anti-groups respectively. By continued proteolytic action there results as the final product of gastric digestion peptones; approximately, an equal mixture of so-called hemipeptone and antipeptone, generally known as amphopeptone. Such a peptone exposed to the proteolytic action of trypsin should obviously break down in part into simple crystalline bodies, leaving a residue of true antipeptone. In truth, this is exactly what does happen when the peptone resulting from gastric digestion is warmed with an alkaline solution of trypsin. The so-called hemipeptone quickly responds to the action of the pancreatic ferment, and is converted into other products, while the so-called antipeptone resists its action completely, thus giving results in harmony with our general conception of the proteid molecule. ALBUMIN MOLECULE. (_Hemi-groups._ _Anti-groups._) ║ ╲ ╱ ║ ║ ║ ╲ ╱ ║ ║ ║   ╳   ║ ║ ║ ╱ ╲ ║ ║ ║ ╱ ╲ ║ ║ Protoalbumose Heteroalbumose Antialbumid (amphoalbumose) (amphoalbumose)  ║ ║ | | ║ ║ ║ | | ║ ║ Deuteroalbumose Deuteroalbumose Deuteroalbumose (amphoalbumose) (amphoalbumose) (antialbumose) ║ | | ║ ║ ║ | | ║ ║ Amphopeptone Amphopeptone Antipeptone On the basis of these facts, and others not yet mentioned, we may accept provisionally, at least, the above schematic view, suggested in part by Neumeister,[93] of the general line of proteolysis as it occurs in pepsin-digestion; a view which clearly expresses the significant relationship of the hemi- and anti-groups in the proteid molecule. [93] Zur Kentniss der Albumosen, Zeitschr. f. Biol., Band 23, p. 391.