302 Notes on the Scales of the 



tain. But inasmuch as the geologic construction of Sche- 

 hallion is very heterogeneous and uncertain, it might be 

 better to search out some hill of more uniform constitution ; 

 and such, according to the experienced testimony of Pro- 

 fessor Jameson, may be met with amongst the mountains of 

 Sutherland, some of which are of quartz from top to bottom. 



C. P. S. 



Notes on the Scales of the Government Survey of Scotland. 



The scales upon which the Government Survey of Scotland 

 should be engraved and published, having naturally excited 

 great interest, and given rise to much diversity of opinion, 

 we have endeavoured to collect some precise information as 

 to the progress, up to the present time, which has been made 

 in this great National work, and the special purposes for 

 which it is designed. 



The Government, or, as it is called, the Ordnance Survey 

 of England and Wales, had, up to the year 1824, been pub- 

 lished on the scale of one inch to the mile ; and the whole 

 country, with the exception of the six northern counties, was 

 finished upon this scale, and has given great satisfaction to 

 the country, as we learn, from the evidence of several eminent 

 civil engineers, and geologists, to whom it has been found of 

 great value in many important works upon w T hich they have 

 been engaged. But in the year 1824-j the whole surveying 

 force of the Ordnance was transferred to Ireland, and as the 

 survey there was designed to form the basis of a general va- 

 luation of the country, for which the scale of one inch to a 

 mile was much too small, the Government directed, after a 

 very mature consideration of the subject, that the scale of the 

 county maps of Ireland should be on the scale of six inches 

 to a mile, and that the large towns should be drawn on the 

 scale of sixty inches to a mile, and that a general map on 

 the scale of one inch to the mile, like that of England, should 

 be prepared by reducing the six-inch maps to that scale. 

 These orders were consequently carried into effect, and the 

 whole kingdom has been engraved and published on the six- 

 inch scale, and the one-inch general map is now in progress, 



