A Sectional Block, to illustrate the extraction of the cube root.

Accompanying this set is a Drawing Slate, designed particularly for young pupils. On the frame are a set of copies for writing and drawing, which are protected from injury in consequence of friction on the desk by cushions made of India rubber inserted in each corner. This slate is equally well adapted for the older pupils, and for all arithmetical operations, and its use is accompanied with less noise than any other form of slate.

A Terrestrial Globe, made of solid, firm material, and so mounted on a simple pedestal that it can be readily removed, and suspended by a cord-and thus be held in the hand, and displayed conveniently for familiar illustrations to a class. They are made from five to eight inches in diameter.

A Hemisphere Globe, cut in equal sections, and opening on a hinge, will solve at a glance many of the difficulties encountered by young pupils in the study of geography, and correct some fundamentally erroneous conceptions which even older scholars are liable to form of latitude and longitude, or from an exclusive use of maps.

The Tellurian is designed to illustrate all the phenomena resulting from the relations of the Sun, Moon, and Earth, to each other-the succession of day and night, the change of the seasons, the change of the sun's declination, the different lengths of day and night, the changes of the moon, the harvest moon, the precession of the equinoxes, the differences of a solar and siderial year, &c., &c.

TELLURIAN.

The Planetarium or Orrery, gives the proportionate size and relative positions, and annual revolutions of the planets, composing the solar system, except the asteroids.

Holbrook's Common School Apparatus, is manufactured by the HOLBROOK SCHOOL APPARATUS MANUFACTURING COMPANY, at Hartford, Conn., and sold, securely packed for transportation, with a manual or text-book for the use of the teacher, for $20.00 a set.

APPARATUS FOR GRAMMAR SCHOOLS.

The School Committee of Boston, in 1847, adopted the following articles as a set of Philosophical Apparatus for the Grammar schools, which was selected and classified by Mr. Wightman, whose long experience in manufacturing apparatus for schools of every grade, admirably qualified him for the work:

The foregoing Set is fully illustrated in "Wightman's Select Experiments," a valuable manual for the teacher.

The following illustrations of some of the articles enumerated in the above list, are taken from "Wightman's Illustrated Catalogue," which persons selecting apparatus will do well to consult before making their purchases. The address is Joseph M. Wightman, No. 33 Cornhill, Boston, Mass.

LAWS OF MATTER AND MOTION.

I

INERTIA APPARATUS.

This Figure represents a very convenient apparatus for illustrating Inertia, a stiff card being projected by the spring, and leaving the ball upon the pillar.

COLLISION BALLS AND STAND.