Page:Popular Science Monthly Volume 8.djvu/653

Rh in schools, and with improvement in methods and results there comes a demand for the special cultivation of teachers, by means of institutes and normal schools.

This complex machinery of education must be thoroughly understood by every efficient teacher in its principles and practical working, and Prof. Phelps's book has been prepared to facilitate this special professional culture. It is written with the warmth of a man who is in earnest, and with the clearness of one who understands his subject. Unsettled questions and difficulties in education are recognized, with judicious suggestions, as in the following passage:

pamphlet, separately printed, contains the first published discussion of work done by the 26-inch Clark refractor of the Naval Observatory. What this work was, and how great necessity existed for its prosecution, may be gathered from the first two paragraphs of the memoir:

It is well known that the two brighter satellites of Uranus, viz., Oberon and Titania, are quite faint objects even in the large 15-inch telescopes of Harvard College and of Pulkova, but the two interior satellites, Ariel and Umbriel, are