"As we have not as yet," says he, "spoken a single word about the very ancient, and I know not whether more ridiculous or perverse, persuasion of our forefathers about semigods, this seems the proper place for saying a few words about this so celebrated figment, as it was chiefly in this period it attained its acmè, and it was believed as a true and necessary article of faith, that there are genii or semigods, called in our language Alfa and Alfa-folk."
Source: wiktionary