Address of Professor Husley. 393 
very simple mode of seeing the facts for oneself, which I may 
as well mpc 
wah. cotton-wool, will remain clear for an indefinite time. 
have sought in vain for any explanation of these facts, xy Ps 
the obvious one, that the air contains germs competent to 
Bas terium, But the alternative is to ‘clan that these Bates 
rise from germs in the air; and if they are thus propagated, 
the | burden of proof that other like forms are generated in a 
different manner, must rest with the assertor of — a 
To sum up the effect of this long chain of evi 
It is demonstrable that a fluid Same fit for “the idevaloy. 
ment of the lowest forms of life, but which ving ins neither 
germs, nor any protein co yand, gives rise to liv in 
great Decwdednes if it is ex oe d to ord vias no such 
development takes place if the air with met i it is in contact is 
mechanically freed from the solid particles which ordinarily 
float in it, and which may be made visible by om means. 
tis demonstrable that the great majority of these a 
are destructible by ek € 9 that some of them are 
living capable Soa the abiies Sermnsof BS 
= — which appear wee Bie anid is exposed to unpurified 
ee the same way yields similar results; but as it con- 
tains organic matter, the argument which follows cannot be based upon it. 
Am. Jour. at -Suooxp Serres, Vor, L, No. 150.—Nov., 1870. 
25. 
