Card/Transcription No.: 620-7

620 Black Dust from Floor.

This consists essentially of: -

(a)
Finely-divided material from decayed and insect-attacked fruits.
This comprises a large proportion of the material.

(b)
The remains of insects, particularly the chitinous skeletons of
small beetles.

(c)
Material that has probably passed through the body of insects

(d)
A small proportion of common salt.