158 



THE G POLO GIST, 



Since the first appearance of Mr. Denton's pamphlet, we 

 have had several opportunities of inspecting the beautiful 

 models which he has prepared to illustrate his viev/s, and 

 have to acknowledge the subsequent receipt of other papers 

 relative to the same subject, with reference to agricultural 

 improvements, dependent solely upon the benefits which a 

 general system of drainage would introducCe We will, how- 

 ever, drop the subject in its relation to agriculture, solely, 

 and consider our author's suggestions with reference to mo- 

 del mapping, adapted to the joint purposes of the Geologist 

 and Agriculturalist. 



In the intimate relation which also exists between these 

 pursuits, we have another proof of the practical value of Geo- 

 logy ; and Mr. Denton, fully aware of this being the case, 

 has taken the necessary means for preserving, in his model 

 maps, such records of the subsoil, as he considers essentially 

 useful for the proper completion of the drainage system. 



Kmodelmap, which, for all the usual purposes of reference, 

 is far more valuable than an ordinary survey, presents the 

 following advantages over the latter system, viz. — In the 

 actual representation of the elevations, therefore, offering the 

 readiest means of distinguishing the natural lines of drainage, 

 and, secondl}^, in enabling the surveyor to represent the sub- 

 soil, either by sectional divisions, on the sides of which the 

 strata maybe coloured, or, as Mr. Denton has suggested, by 

 the insertion of a number of pegs, of about a quarter or half 

 inch diameter, along certain lines on the principal elevations, 

 upon which the respective thicknesses of the strata would be 

 represented by different colours, in accordance with those of 

 the surface. 



The landed proprietor who possesses such a model map of 

 his property, (the cost of which would not be more than 

 double that of an ordinary survey), would be enabled to tell 

 the dip of the strata, or the direction of the beds in any one 



