Both nuts and pulses contain, like flesh meat, a large quantity of proteid in a concentrated form.

Add cautiously dilute acetic acid until there is a copious, granular-looking precipitate of the chief proteid of milk (caseinogen), formerly regarded as a derived albumen.

Rice, on the other hand, contains less proteids than any other cereal grain, and is the least nutritious.

The essential use of the proteids to the tissues is to supply the material from which the new proteid tissue is made or the old proteid tissue is repaired.