Allen Alexander. An etymological analysis of Latin verbs

London: Printed for Taylor and Walton, 1836. — 370 p. For the use of schools and colleges.Every word contains some essential element, which indicates its principal meaning. Most words contain, besides this element, other parts—letters
or syllables—which modify its meaning, and show the nature of its relation to the other words in its neighbourhood. These qualifying parts are generally put either before or after the element; sometimes both before and after. In order to ascertain their precise value in each case, it is necessary to detach them individually from the element, and to compare their use in similar combinations. In addition to this, the laws of euphony, or those changes established by the people's notion of agreeable sounds, frequently render the insertion or removal of a letter necessary. If required, a euphonic letter may be inserted even in the middle of the word, or the letters of the element may be so modified, or altogether lost, as to render the element almost indiscernible.