David Crystal is a prolific scholar of linguistics who specializes in language pathology, phonetics, and linguistic disability.
What I admire most about Crystal's scholarship in Spell It Out is its humanity. He never loses sight of language as a form of human expression—whether through orthography or pronunciation.
Consider for example, the history of the word, "ghost":
"Why is there an h here? And in ghastly, aghast and the whole family of related words –– ghostly, ghostliness, ghastliness, ghostbusters and so on? It wasn't there when the word first came into English. In Anglo-Saxon England we find it used in the form gast, with a long 'ah' vowel...But there was no h in the Anglo-Saxon spelling: the Holy Ghost was a Hali Gast. Nor was there an h in the word in Chaucer's time…Then along came Caxton [William Caxton, the first printer and publisher of books in England], who sets up his printing-shop. But who was to carry out the painstaking task of ...