I've made many posts going into the details of various situations in relation to Scottish statutory, census, OPR and other records.
The reason for this is that, unless you understand, sometimes in considerable detail, the full process that led to the creation of a particular record, then you will not have anything approaching a full understanding of the numerous errors than can creep into the whole process...... and be able to breach those d****d brick walls.
While I have a reasonable level of expertise in terms of the the various Scottish records, I rely heavily on sources such as the 440 page "Vital Registration: A Manual of the Law and Practice concerning The Registration of Births, Deaths and Marriages", author G T Bisset-Smith, published by William Green & Sons, Edinburgh, in 1907.
Until and unless you have read this, you would just not believe the range of most unusual situations that registrars had to cope with
I can only comment that I'm very glad that I was not the registrar for a small, rural registration district in the late 1800s in terms of the quite wierd situations that could occasionally come up, along with the question of how such an unusual situation should be handled in terms of the entry on the appropriate register of B or M or D ......... and, believe me!, you ain't seen anything yet in terms of the situations that can come up that you haven't even imagined
Similar considerations apply to the 1841 to 1901 censuses, and I can only encourage you to look at http://www.talkingscot.com/censuses/census-intro.htm and read and appreciate the various instructions to the enumerators, - together with FreeCen Scotland we have recently located these instructions for the 1861 and 1871 censuses, - which will shortly be uploaded to TalkingScot, - as will be a conversion table for the census district numbers used in 1851 only to those used in 1861 and later.
David