Lincoln Institute of Philadelphia v. Lincoln University of Chester County
Several attempts to find more information about this elusive Lincoln Institute in Philadelphia proved fruitless, but last night I serendipitously came across some answers! My first clue came (unsought) while I was browsing a copy of our online Lincoln University Herald alumni newsletters. On the last page of the 1899 issue, in a brief note about two common mistakes made about Lincoln University was mention of Lincoln Institute, "an academy for Indians," whose name was often misapplied to Lincoln University. Prompted by this note, I was motivated to go back to Google (as my last search had been several years ago), and this time, thanks to Google Books, I came up with information! The search terms [Lincoln Institute Philadelphia Indian ] brought up History of Philadelphia, 1609-1884 by John Thomas Scharf, Thompson Westcott - Philadelphia (Pa.) - 1884 - 2399 pages.
On page 1698 the Lincoln Institute is described as having been founded in 1866 by Miss Mary McHenry in her home at 1902 Chestnut Street as a home for orphaned children of soldiers, and then transformed (after the original orphans had grown up and left) into an institute for "some seventy Indian girls, under an arrangement with the government of the United States." Interestingly, the Lincoln Herald note, published over a decade later, indicates that the Lincoln Institute had been recently denied an appropriation by Congress. So perhaps it was on its way to oblivion by that time. I hope that anyone with additional information will contact me, so that I can help the next researcher investigating The Lincoln Institute in Philadelphia!