Hector Berlioz 
Treatise on Modern Instrumentation and Orchestration [PDF ebook] 
To Which Is Appended the Chef D’orchestre

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. Baillot, on the contrary, sometimes lowers the G half a tone, in order to produce softer and deeper effects. Winter has even employed Ft] instead of the G with a similar intention.