Louis Lablache 
Lablache’s Abridged Method of Singing, or a Rational Analysis of the Principles According to Which the Studies Should Be Directed for Developing the Voice and Rendering It Flexible 
With Examples for Illustration and Progressive Vocalizing Exercises

Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. There are three things to consider in the art of singing – First, sentiment; second, voice; third, execution. Sentiment and voice are chiefly the gift of nature. Study can develop and strengthen them, but it cannot give them to one who is entirely destitute of them. Execution can be acquired and perfected, with more or less labor, according to the aptness of the individual. As before singing well it is necessary to sing in some manner, we shall have to occupy ourselves, at first, with the voice and with its mechanism. We shall afterwards speak of musical sentiment, and of the proper means for developing it.