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THE FOURTEEN WEEKS' COURSES

IN

NATURAL SCIENCE,

BY

J. DORMAN STEELE, A.M., Ph.d.

Fourteen Weeks ii; Natural Pljilosophy, . . $1.50

Fourteei; Weeks ii; Cljernistry, .... i.so

Fourteei; Weeks ii] Descriptive Astronomy, . 1.50

Fourteei] Weeks in Popular Geology, . . 1.50

Fourteeq Weeks in Hurqan Physiology, . . 1.50 A Key, containing Answers to the Questions

and Problems in Steele-s 14 Weeks'Courses, 1.50

h HISTORICAL SERIES,

on the plan of Steele-s 14 Weeks in the Sciences,

inaugurated by

tj Brief History of tlje United States, . . 1.50

The publishers of this volume will send either of the above by mail, post-paid, on receipt of the price.

The same publishers also offer the following standard scientific works, being more extended or difficult treatises than those of Prof. Steele, though still of Academic grade.

Peck's Ganot's Natural Pljilosophy, . . . 1.75

Porter's Principles of Cljerrjistry,.... 2.00

Jarvis' Physiology arjd Laws of Healtlj, . 1.65

Wood's Botanist and Florist, 2.50

Cljarrjbers' Elements of Zoology, .... 1.50

tyclntyre's Astronomy and the Globes, . . 1.50

Page's Elenjents of Geology, 1.25

Address A. S. BARNES & CO.,

Educational Publishers,

NEW YORK OR CHICAGO.

Entered according to-Act of ^OBan-tyrtnVhe year 1869, by

In the Clerk's Office of tbi fcnjtr/cA (ff^^i^he ynited States for the Soothe!

t's AST. „

dkli^

PREFACE.

During the past few years great advances have been made in astronomical science. A new horizontal parallax of the sun has been established. This has materially altered the estimated distances, etc., of the planets. The sun is much nearer us than we supposed, and light has lost a little of its wonderful velocity. Much additional information has been obtained concerning Meteors and Shooting Stars. The investigations connected with Spectrum Analysis have been especially suggestive. Thus on every hand the facts of Astronomy have been accumulating. As yet, however, they are scattered through many expensive foreign works, and are consequently beyond the reach of most of our schools. It has been the aim of the author to collect in this little volume the most interesting features of these larger works. Believing that Natural Science is full of fascination, he has sought to weave the story of those far-distant worlds into a form that may attract the attention and kindle the enthusiasm of the pupil. The work is not written for the information of scientific men, but for the inspiration of youth. The pages therefore are not burdened with a multitude of figures which no memory could possibly retain. Mathematical tables and data, Questions for Review, and also a Guide to the Constellations, are given in the Appendix, where they may be useful for constant reference.

The author would call particular attention to the method of classifying the measurements of Space, and the practical treatment of the subjects of Parallax, Harvest Moon, Eclipses, the Seasons, Phases of the Moon, Time, Nebular Hypothesis, &o.

To teachers heretofore compelled to use a cumbersome set of charts, it is hoped that the star maps here offered will present a welcome substitute. The geometrical figures showing the actual appearance of the constellations, will relieve the mind confused with the idea of numberless rivers, serpents, and classical heroes. The brightest stars only are given, since in practice it is found that pupils remember the general outlines alone.

Finally, the author commits this little work to the hands of the young, to whose instruction he has consecrated the energies of his life, in the earnest hope that, loving Nature in all her varied phases, they may come to understand somewhat of the wisdom, power, beneficence, and grandeur displayed in the Divine harmony of the Universe.

"One God, one law, one element,
And one far-off Divine event
To which the whole creation moves."

The following works, among others, have been freely 30tt6ulted in preparing this volume:

The Heavens Guillemin.

Astronomy Chambers.

Introduction to Astronomy Hind.

Solar System Hind.

Popular Astronomy Airy.

Popular Astronomy Arago.

Astronomy Norton.

Astronomy Robinson.

Astronomy Loomis.

Age of Fable Bulflnch.

Poetiy of Science Hunt

Outlines of Astronomy HerscheL

Popular Astronomy Mitchell.

Astronomy and Physics WhewelL

Annual of Scientific Discovery Kneoland.

The Chemical News.

Publishers- Notice.—Teachers will find in each edition of this Series certain changes; not such, however, as to cause any inconvenience in the use of all the editions in the same class. These are to be considered, not as corrections of errors, but as improvements suggested by the constant advance made in science, and by practical work in the school-room. The publishers are determined to spare no expense in making this Series increasingly worthy of the unprecedented success it has attained.

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