Fogg Museum. Nineteenth Century Portraiture opened as scheduled last week, to some surprise. Very satisfying to the voyeurs in the area: General Burnside really did have sideburns, and Carrie Nation left out her false teeth. The students who put the show together have added an excellent commentary on the early photographic processes exhibited here. Down the hall is Color In Art, a technical explanation of a Professor-Emeritus' theories on the subject. An exhibit at the Museum of Science compliments it. But be forewarned: they cost money, and the Fogg is free.

Graphics I and Graphics 2, a gallery at 168 Newbury St. In Boston is showing the graphic work of Jean Folon, starting Monday. Folon draws little men with round hats for New Yorker covers, and line caricatures for the Editorial page of the New York Times. In 1965 he won first prize at the Third Italian Triennale for "Humor in Art". The Coop has some of his posters in their window, if you're unsure who he is--come exam time, his humor will be a welcome thing.

In this weather, you should really be outside: Carpenter Center boasts a sculpture-fountain (Stainless steel and moving water) by Susumu Shingu, a good way to satisfy both aesthetic and physical needs. But if Museum-tromping is imposed upon you, console yourself with Renoir's "Bal a Bougival" at the MFA. A regular exhibit that nobody talks about much, but it's the most beautiful painting in Boston.