BY PROF. J. T. EDWARDS, D.D.

Director of the Chautauqua School of Experimental Science.

In our day science invades the kitchen. Knowledge knocks at the sitting

room door. Literature and art visit the parlor of even our humble homes.

To do anything in furtherance of popular education is a delight. Mine be

the task of making the laboratory and the home better acquainted.

The limitations of an article for THE CHAUTAUQUAN cause the first

embarrassment. One must at once become an eclectic, and select wisely the

_best_ from a wide field. The next difficulty is to give coherency and

classification to the truths selected. Upon what golden cord shall we

arrange the shining truths?

Let us use an ancient, though incorrect classification of elements:

Water, air, earth, fire, adding another, organisms. Indeed, this is about

the division of matter which the common people make to-day, although

chemists tell us that neither of these is an element, and that the

simple, indivisible substances in nature are sixty-six in number. As

chemistry and physics are so closely related, we shall consider each of

these topics from the standpoint of both these sciences. This will call

for ten articles, on the following subjects: Chemistry of Water; Physics

of Water; Chemistry of Air; Physics of Air; Chemistry of Fire; Physics

of Fire; Chemistry of Earth; Physics of Earth; Chemistry of Organisms;

Physics of Organisms.

The Chautauquan, Vol. 05, October 1884, No. 1 · 第 29 / 208 题