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I RECENTLY carried out an experiment which I shall not soon have the opportunity of repeating, and which I am consequently anxious to put on record. It is probably now familiar to those interested in the mailer, that the experiments of Dr. Sanderson have established the fact that in an infusion of turnips and cheese prepared as directed by Dr. Bastian, heating to a temperature of 102 C. is sufficient to prevent the subsequent development of life (Bacteria) in the infusion even when the exposure to that temperature is only maintained for a few minutes. Boiling for five or ten minutes, according to Dr. Sanderson, is not sufficient to prevent the subsequent development of Bacteria, but according to the experiments of Dr. Pode and myself, boiling for ten minutes or a quarter of an hour i s sufficient, provided that care has been taken to exclude visible lumps of cheese, and when the infusion is enclosed in a tube which tube is submerged in boiling water. Further, Dr. Sanderson has stated the following most important result, namely, that exposure to the boiling temperature (100° C.) was in all cases sufficient to prevent the subsequent development of Bacteria if it was carried on for so long as one hour. |
