SPONTANEOUS GENERATION. 21 



filaments of a doubtful vegetable appearance were found, xxxii. 

 was opened on the forty -second day, and contained ferment cells 

 and monads (fig. 5, a). An escape of gas took place when the 

 flask was opened, xxxi. was opened on the forty-third day, and 

 found to contain ferment cells in large numbers, in different 

 stages of cell multiplication ; as in xxxii., there was an escape 

 of gas. 



" Expt. xxxiv. (C.) March 27th. Juice of mutton, in a her- 

 metically sealed flask, was boiled 5' in a Papin's digester, under 

 a pressure of two atmospheres.* A film formed on the fourth day. 

 It was opened several days later, in the presence of Professor 

 Gray, and found to contain Vibrios, (fig. 5, 6,) and Bacteriums, 

 (fig. 6,) some of them moving- with great rapidity. 



" Expt. xxxv. (C.) The same as the preceding, and boiled in 

 Papin's digester 10' and under the pressure of five atmospheres.f 

 No film was formed. The flask was opened on the forty-first 

 day. Monads, (fig. 5, a,) and Vibrios, (fig. 5, b,) were found, 

 some of the latter moving across the field. No putrefaction ; the 

 solution had an alkaline taste. 



"Expt. xxxvi. (C.) March 28th. Beef-juice was filtered and 

 boiled, as in the preceding experiment, 15', under two atmos- 

 pheres. Opened on the forty-first day, and no evidence of life 

 was found. When the end of the flask was heated, previously 

 to opening, it collapsed. 



"Expt. xxxvii. (C.) March 28th. The same as the preced- 

 ing; boiled 15' under five atmospheres. Opened on the forty- 

 first day, and no evidence of life was detected. 



branches to project into the air. The emergence from its fluid habitat is the 

 beginning of another stage in its growth ; and in fact it could not otherwise per- 

 fect its development. In course of time, then, its branches become a tangled 

 mass of white threads and bristling points. This is the condition in which it is 

 known as " white mould " ; or, when the bluish or greenish spores (seeds) are 

 ripened, on the ends of the bristling points, " blue mould." 



* Two atmospheres are equal to 250.52 Fahrenheit, or about 38 above boil- 

 ing point. 



The pressure of five atmospheres is equivalent to 307.5 Fahr., or about 95 

 above the boiling point. 



