1 <>C) OXYGEN AND M I ROGE^i.

CONVERSATION V.

ON OXYGEN AND NITROGEN.

MRS. B.

To-day we shall examine the chemical pro-perties Of the ATMOSPHERE.

CAROLINE.

I thought you said that we were to learn thenature of oxygen and nitrogen, which comenext in our table of simple bodies ?

MRS. B.

And so you shall: the atmosphere is composedof these two principles; we shall therefore ana-lyse it, and consider its component parts sepa-rately.

EMILY.

I always thought that the atmosphere had beena very complicated fluid, composed of all the va-riety of exhalations from the earth.