Household Bacteriology (Classic Reprint)
(Excerpt from Household Bacteriology
The soil used was a ...)
Excerpt from Household Bacteriology
The soil used was a kind of beef-broth jelly. The seed was ordinary dust from an ordinary room. The boxes had been baked for over an hour in a very hot oven. The jelly had been steamed a number of times, until no living thing could possibly be therein.
A dust garden planted after a room had been carefully swept is shown in Fig. 2 5. When the cover of the box was removed and the dust raised by the broom into the air had settled on the soft, sticky jelly, something happened! In about twenty-four hours little specks appeared, which rapidly or slowly grew larger and developed various colors. Unfortunately, the photograph does not show the delicate greens, yellows, and blues of the different spots. As they grew larger some spots revealed a feathery or velvety surface and, like that at the left side, a dark center with dust flying from it. The other spots were shiny, wet, or waxy in appearance, and never showed any increase in height or any dark, dusty center.
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