Transcriber's Note
Some spelling variation exists in this ebook (e.g., collar-bone and collarbone, chest-cavity and chest cavity, mucus and mucous). These variations have been retained to match the original text.
Minor corrections to punctuation have been made without note.
The following additional changes have been made:
Table of Contents: Changed 170 to 169 to accurately reflect page number in text
Page 75: Changed larynogoscopists to laryngoscopists (by amateur laryngoscopists)