2 Pasteur on Spontaneous Generation. 
Coast Survey at Washington proved an intolerable nuisance. It 
| kept at the temperature of 80° or 90° F. for an indefinite 
period without producing any organisms or undergoing any 
change whatever. 
‘e test the influence of atmospherie dust upon a fluid thus 
hermetically sealed, Pasteur placed a pledget of eotton or asbestos 
in a small tube and caused a current of common air to pass 
transferred to a larger T-shaped tube, one end of which was | 
eonnected by India rubber with the sealed flask, another end — 
and the small tube containing the ee petaae dust was passed 
air. The neck of the 
ask was then again hermetically sealed by means of the blow- 
pipe. Many flasks were prepared in this way and in every case 
after standing in a warm situation for 24 to 36 hours, vegetation 
