The handwriting reads: Anna Weld and Agnes Grace Weld (Anne Weld was the mother of Agnes Weld. Her maiden name was Sellwood and she was the sister of Emily Tennyson (nee Sellwood) Lady Tennyson, wife of Alfred Lord Tennyson.
This is a photograph not taken by Lewis Carrol but by W. Jeffrey which was one of Alfred Tennyson's favorite photographers according to his son Hallam and wife Emily Tennyson! The address where this photograph was taken is: 114 Great Russell Street, Flormsbury or is that Bloomsbury(? Sorry if I got that wrong), London. Dated circa 1857.
If you want more information on Ages Weld's life, please read my article, Agnes Weld