The signature looks like Ada Wilson, Born in 1873 -- maiden name Ada Briggs, mother of Lillian who was the wife of Earl Gage who ran a meat and grocery market on Main St in Morris. She was a nurse and married to Charles Wilson -- who was born in 1846.
To zoom in click on the first link below.
To make the back of the card easier to read I have rotated the image and attached it below.
7 Oct 1888 - J.P. Kenyon sold the corner store $3000. To J.A. Ward, but a 11 July 1888 edition includes J.A. Ward & Co. in advertisers. 30 April 1879 it was J.P. Kenyon when he was selling Dr. Fenner’s patent medicines.
