thanks . the alexander and mary herschell I am researching ..... alexander was born in 1848 in Montrose, Scotland.  mary was born in 1858 , mary reilly.. in linligoth, Scotland.  I have marys death..she died aged 33 in latchford, warrington..    the alexander and mary you have found is their oldest son alexander who also married a mary. they are on the1901 census in heaton, Newcastle on tyne.
the last record I have for alexander  1st  is the 1881 census in lythe, Yorkshire. I cannot find him after this ... can anyone help.?   could they have been, as I strongly suspect, travellers ?