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Questions and Suggestions (Mix T gelatine with C cold)

1. Mix 2 T. gelatine with 1 C. cold water. Dissolve over hot water and pour into two saucers. Cover tightly and put into the oven and bake for one hour to kill any bacteria or molds that may be on the gelatine. Remove from oven and set into ice box to harden. When cold put on table in dining room or kitchen. Remove the cover from one saucer and leave the other tightly covered. Sweep the dining room without any care in regard to dust. Put the two saucers aside for forty-eight hours. See which has the greatest crop of mold and bacteria at the end of that time.

Whence did the bacteria and mold come?