What is the difference between a Tonsil Parlor and a Barber Shop?

Not much shows up in a Google search for "Tonsil Parlor," and I suspect you may have asked the similar question just posted at amazon. I am inclined to agree with Hooley at that site, that "Tonsorial Parlor" makes more sense as a synonym for Barber Shop
see http://dictionary.reference.com/browse/tonsorial

this may have been mistakenly or humourously corrupted into "Tonsil Parlor" in your source for this question? This seems to be borne out by the photo posted at
http://www.flickr.com/photos/penguinfeedingtime/5286543504/

which is tagged "Club Ed- tonsil parlour," but the photo shows an old building with the lettering "Tonsorial Parlour" in the window.