That's correct re., 1891, if you still need it...
1891 census:
James Arnott
Age: 34, b. abt 1857, Gladsmuir, Haddingtonshire
Head
Spouse: Marry Arnott
Reg dist: Dunscore
Civil parish: Dunscore
County: Dumfriesshire
Address: Allanton Stable Yd
James Arnott 34 [Coachman [dom servt]]
Marry Arnott 35 [b. abt 1856, Salton, Hadd']
Adam Arnott 1* [b. abt 1890, Gifford, Haddingtonshire. Scholar]
ED: 1; Page: 10; Line: 2; Roll: CSSCT1891_394
* I suspect this should be 11y and 1880, I haven't checked for a death; scholar probably does it for an error in age.
Geoff