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[72] The fluids were boiled at the low temperature, with the aid of an air-pump, merely in order to be able to procure a more perfect vacuum in the flasks; these experiments being destined to show whether the simple (uninoculated) solutions would become turbid in vacuo—that is to say, without the oxidizing influence of the air—when they had not been exposed to an amount of heat sufficient to destroy any living or dead ferments which they might contain.
[73] A deposit of this kind is almost invariably found in such solutions after their fermentability has been lowered by previous boiling. Growth takes place very slowly in these cases, and also when similar boiled fluids are contained in vacuo.
[74] Loc. cit. p. 71.
[75] Loc. cit. pp. 75 and 76.
[76] Loc. cit. pp. 83 and 84.
[77] The subsidence of the atmospheric particles has been ably demonstrated by Professor Tyndall.—See ‘Nature,’ 1870.
[78] See M. Pouchet’s ‘Nouvelles Expériences sur la Génération Spontanée,’ &c., p. 69.
[79] See various communications in ‘Compt. Rend.’ (1863), t. LVII.
[80] Loc. cit., p. 40.