Hi Sheenie
There is no Mathewson listed in CT in 1859 but there is an Alexander Geddes Matthieson. He is listed as a haberdasher in Longmarket Street (1847 - 1856) and then having a "scotch & english clothing warehouse" in 1859 and then the same in Grave Street from 1860 - 1865. There is no listing for him in 1866, 1869, 1870 or 1872.
There is a death notice on NAAIRS for Alexander Geddes Mathiesan in 1871, but unfortunately I am not able to look it up for you.
Hope this helps
Regards
Sandy