Just a thought - Scott's Atlas of Burlington County (1876) show a S. Still Hr. (Heirs?) residence and a G. Thompson residence at the same intersection in Shamong Township. This is the current Stokes Road/Grassy Lake intersection that is probably 1-2 miles from "downtown" Indian Mills. By this time, Dr. Still had a home and office at CrossRoads in Medford but perhaps some of his family remained in Indian Mills when he moved to Medford. Interestingly, the atlas shows a G. Thompson as a nearby neighbor to Dr. Still in Medford as well.
In writing this, it just occured to me that Stokes Road (in Shamong) is Rt 541 and Dr. Still's office at Cross Roads (in Medford) is on (or just off of) 541. Weird.
Rich