If anyone is interested, I have a website called the Bischoff Family Archives. It contains some information about the Bischoff Family originating in Illingen, Wurttemberg, Germany. It also has a rather large family tree with a few Bischoffs that left for America and "disappeared". Among them are:
1. Johann Conrad Bischoff, b.1814, emig.1830 (son of Matthaus Bischoff and Sophia Barbara Muller.)
2. Johannes Jakob Bischoff, b.1827, emig.1854 (son of Johann Matthaus Bischoff and Rosina Dorothea Obergfoll.)
3. Wilhelm Heinrich Bischoff, b.1842, emig.18-- (son of Gottlieb Wilhelm Bischoff and Johanna Magdalena Weisseise.)
The website can be found at www.geocities.com/~bischoff-page
. Hope this helps someone find their German roots.