E: Science as young people study it has two chief aspects, or in other words, it may be roughly divided into two parts, namely, the study of _the things which come upon us,_ as it were, and the study of _the things which we deliberately devise._ The things that come upon us include weather phenomena and every aspect and phase of the natural world, the things we cannot escape; and the things we devise relate chiefly to the serious work of the world, the things we laboriously build and the things we deliberately and patiently seek.
F: See discussion on Bacon"s New Engine on page 52 {6}
G: Opens the mind, that is, for those things which are conformable to or consistent with the ideas. The history of science presents many cases where accepted ideas have closed the mind to contrary evidences for many generations. Let young men beware!
H: See Page 71 {7}
J: A volcanic ma.s.s of rugged spurs radiating from a great central core; points and ridges rising, beautifully red, from immense fields of snow. D. and the writer call it Mt. McDonald, but having made no survey, the purely sentimental report which we could send to the map makers in Washington would not suffice as a record there.
K: The crater of Specimen Mountain is worn away on one side by water, and the crater now forms the head of a ragged gulch. Near the head of this gulch is a slope of loose stone, as steep as loose stone can lie, which has a vertical height of 1500 or 2000 feet.
L: Among the Greeks an idiot was a man who thought only of his private affairs, a privately minded man.