"When her face is half joy, half sorrow."  From Pearson's, 1904.

Here's some homogenization over time, as depicted by Peter Eng for Die Muskete, 1924.

It's only funny if some thought and imagination go into it.  By Gus Edwards for Cartoons Magazine, 1917.

From Fun magazine, 1879.

"Which side of your face is more intelligent?"  From Popular Science Monthly, 1921.

"Effect of the Grouch Germ on persons who become infected by associated with the Chronic Grouch."  From The Medical Pickwick, 1920.

INSTRUCTIONS: Click for another expression.

This is what the "good stuff" looks like, from American Florist, 1908.

"The magic power of a few little lines."  From Popular Mechanics, 1922.

"Thou shalt not always wear a cross and ugly look especially in cold weather as the features may become frozen and crack.  Look pleasant occasionally."  From 1907.

From Deirdre by Thomas William Hazen Rolleston, 1897.

Smithsonian Institution's Bureau of American Ethnology "Bulletin," 1938.

From Judy, Or The London Serio-Comic Journal, 1877.

From Design in Landscape Gardening by Ralph Root, 1914.

Here's the transformation of a Freshman student into a dyspepsia tablet [and a precursor to the "This is your brain on drugs" ad campaign], from Hunter College's Wistarion yearbook, 1917.  Many such transformations are covered in How to Hoodoo Hack a Yearbook.

From a series of postcards, 1882.

From Mary Baldwin Seminary's Bluestocking yearbook, 1909.  See How to Hoodoo Hack a Yearbook.