William Shakespeare (the voice teacher, not the playwright) wrote this treatise on singing and published it in the early 20th century. Of the various methods from this era, I find this one of the most accurate, concise and useful. (On the other hand, I can barely understand why a teacher would confine themselves to a generic set of exercises when every student presents a unique set of issues. For me, the second half of the book is wasted space, as it merely presents a series of “progressive” exercises that have little to offer in the way of instruction.)
I bought and scanned a copy of this book, only to discover that it was already available on Google’s Book Search. Since Google allows one to download a searchable PDF file of public domain books for which it offers “full view”, there is little point in me adding my own, non-searchable version. Here is a link to the Google’s copy:
Update: There is also a complete copy, split into two pdf files, at The University of Rochester: The Art of Singing