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AIR-GERMS AND SPONTANEOUS GENERATION.
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water, which had been kept for two or three months in a heated stove, without any development of organisms, to an apparatus arranged like that in Fig. 3.
![](http://upload.wikimedia.org/wikipedia/commons/thumb/a/ab/PSM_V09_D115_Pasteur_apparatus_for_germ_studies.jpg/400px-PSM_V09_D115_Pasteur_apparatus_for_germ_studies.jpg)
Fig. 3.—M. Pasteur's Apparatus For the Introduction of Calcined Air into Flasks Containing Organic Infusion.
The pointed end of the flask passed into a strong glass tube .39 to 46 inch in its inner diameter, within which he had placed a piece of tube of small diameter, open at both ends, free to slip into the larger tube, and inclosing a portion of one of the small plugs of cotton loaded with dust. The larger glass tube is bound to a brass tube in form of a T, furnished with stopcocks, one of which communicates