Nice find by Carl - jump over to Hoxsie! and check out the (1860's?) ad for Greenbush Steam Cracker and Biscuit Manufactory.
So what were all those mysterious crackers? The Complete Bread, Cake, and Cracker Baker, J. Thompson Gill, 1881, devotes a full page just to the confusion between crackers and biscuits, before moving on to crumpets and jumbles.
For some more insight into Greenbush in this era, check out this Troy Record article from October 21, 2010: "You could look it up back in 1868".