“ Examples: hot, hotter; begin, beginning. Exceptions: (1) gas, gases. (2) The letters w, x, and y are not doubled. Examples: show, showing; box, boxed; pay, paying.
In words not accented on the last syllable, the final consonant may or may not be doubled. Examples: traveler may be spelled traveller ”

“ Transcriber's Note: Text enclosed between curley brackets was in cursive writing in the original {cursive}. Pg 69 Replaced "for ́mu-lae" with "for ́mu-læ". Pg 73 Replaced "zo-ol ́o-gy" with "zo-öl ́o-gy". ”