2. The kaleidoscope is an optical instrument in which an endless variety of beautiful patterns or forms may be viewed by changing its position.
4. The stereoscope is an instrument, with two eye glasses, for giving to pictures the appearance of solid forms as seen in nature.
PART TWO
Letters, Sounds, Syllables, Words, Principles
of Pronunciation, and Rules of Spelling.
SEVENTH YEAR.
(First Month.)
TERMS TO BE DEFINED.
An ELEMENTARY SOUND is the simplest sound of spoken language.
There are forty-four elementary sounds in the English language. As there are only twenty-six letters in the alphabet some letters represent more than one sound. Certain marks or distinguishing characters used with the letters to indicate the various sounds are called DIACRITICAL MARKS.