This book was most likely a promotional piece, and so it has over 200 recipes (with and without bitters) of food and cocktails.
Since it was made to be popular, it features only the most popular drinks at the time like Mamie Taylor, Whiskey Smash, and Gin Sour. It is a great book to date cocktails as they emerged or disappeared from favor.
Angostura Bitters was invented by Dr. Siegert in 1824 to cure all ailments - except the one you had. Lucky for us it was added to alcohol cures, as the umami and flavor make drinks ever so much more so.