ic
acids.

E. Lecithoproteins--compounds of proteins with phospholipins.

F. Lipoproteins--compounds of proteins with fats, existence in
nature doubtful, artificial forms easily prepared.

3. _Derived Proteins_

A. Primary protein derivatives.

_a._ Proteans--first products of hydrolysis, insoluble in
water.

_b._ Metaproteins--result from further action of acids or
alkalies, soluble in weak acids and alkalies, but
insoluble in dilute salt solutions.

_c._ Coagulated proteins--insoluble forms produced by the
action of heat or alcohol.

B. Secondary protein derivatives.

_a._ Proteoses--products of hydrolysis, soluble in water,
not coagulated by heat, precipitated by saturation of
solution with ammonium sulfate.

_b._ Peptones--products of further hydrolysis soluble in water,
not coagulated by heat, not precipitated by ammonium
sulfate, give biuret reaction.

_c._ Peptides--individual amino-acids, or poly-peptides, may or
may not give biuret reaction.

The plant proteins which have been investigated, thus far, fall into these
groups as follows:

1A. _Albumins_

Leucosin, found in the seeds of wheat, rye, and barley.

Legumelin, " " pea, horse-bean, vetch, soy-bean,
lentil, cowpea, adzuki-bean.

Phaselin, " " kidney-bean.

Ricin, " " castor-bean.

1B. _Globulins_

Legumin, found in the seeds of pea, horse-bean, lentil and vetch.

Vignin, " " cowpea.

Glycinin, " " soy-bean.

Phaseolin, " " beans (_Phaseolus spp._)

Conglutin, " " lupines.

Vicilin, " " pea, horse-bean, lentil.

Corylin, " " hazel nut.

Amandin, " nuts of almond and peach.

Juglansin, " seeds of walnut and butternut.

Excelsin, " " Brazil nut.

Edestin, " hemp seed.

Avenalin, " oats.

Maysin, " corn.

Castanin, " the seeds