874 M. C. Lea on the Influence of Ozone 
second, very pure river water was used. For the first, phosphate 
of soda, silicate of potash, sulphate of magnesia, nitrate of lime 
and sesquichlorid of iron were added to water in a proportion 
such as to be equivalent to three-tenths of one per cent of solid 
matter. In order to afford a just term of comparison, two yes- 
sels every way similar were filled with this prepared water, were 
covered with gauze so that the gauze should rest on the surface 
of the water, and were placed under bell-glasses resting on glass 
pee. Wheat and maize grains were placed on the gauze, and 
eneath one bell-glass was introduced the ozone-generating mix- 
ture. 
2d day.—Germination appeared to be more advanced in the 
vessel containing the ozone. Seeds, however, of like origin, and 
exposed to the same influences, germinate so irregularly that 
much importance is not to be ascribed to this. 
3d day.—The seeds in ordinary air had overtaken the others. 
They were already covered with mould, of which no sign ap- 
peared on those exposed to ozone. 
4th day.—Mouldiness much increased in the one, still nonein 
the other. The rootlets of the plants exposed to ozone begin to 
exhibit remarkable effects, extending themselves upward ir 
stead ownward, and becoming pinkish at the extremities. 
5th day.—Ozone plants much behind. 
8th day.—The disposition of the roots of the plants exposed 
to oz row upward still continues. Of the wheat plants, 
fully one-half the rootlets have shot directly into the air. The 
only maize plant which has as yet germinated has sent up @ 
healthy plumula over one inch in length; its three rootlets are 
all directed upward and away from the water. Nothing in the 
least similar has taken place in any of the seeds not exposed to 
the influence of ozone. 
ately ed to grow; the strongest plant attained a height of 
six inches, and developed six 
did xceed one-tenth of those produced : f the 
equal number of hea seed ne curious result 0 
almest 1 nee of roots was that the wheat plants oe 
