Things of Science unit from 1963. A lot of the early Things of Science units appear to be about materials. Copper, Silk, Cotton — just to name a few. Although a little unusual this unit continues in that vein. Looking at the list of things that are supposed to be included, I maybe missing some bits of wood, but otherwise the yeast appears to be there.

Here is the booklet:

Things of Science #277 — Yeast From Trees

More Things of Science scanned here.

The “things”:

Yeast From Trees