V. MAPS, ETC. 683 



3225. Terrestrial Globe of 80 cin. diameter, with complete 

 frame-stand. Dietrich Reimer, Berlin. 



3226. Terrestrial Globe of 34 cm. diameter, on a wooden 

 stand. Dietrich Reimer, Berlin. 



3227. Another one, on an iron stand with semi-meridian. 



Dietrich Reimer, Berlin* 



3228. Another, with complete frame-stand. 



Dietrich Reimer, Berlin. 



3229. Tables for Measuring Distances and Heights. 



Bau Deputation) Hamburg. 



3231. Terrestrial Globe, 48 cm. diameter. 



Ernst Schotte, Berlin. 



3232. Pour Maps of France. M. Delesse, Paris. 



1. Agricultural Map of France. On this map is shown the various cultures 

 or crops by conventional colours, the shades of which are proportionately 

 darker according as the returns or yields are more important. 



If we consider the arable .lands, which occupy the largest portion of France, 

 they will of course vary yearly in their produce, but it is possible to form 

 a money estimate of their average annual return per hectare. 



By studying the figures for the cantons, taking into account their shape, 

 as well as their elevation, and the mineral composition of the soil, curves 

 have been traced showing the annual revenues of 20, 40, 69, 80, 100, and 120 

 francs. 



For the woods, meadows, and vineyards, where the culture is permanent, 

 there have also been traced curves of equal revenues, showing the average 

 returns per hectare. 



Giving to the cultivated lands, the woods, fields, and vineyards, their con- 

 ventional colours, the depth of shade of these has been graduated according 

 to the various curves to which they correspond. 



Although the map is on a reduced scale of 4,000,000, it nevertheless 

 enables an estimate to be formed of how the agricultural riches of France is 

 subdivided. 



2. Hydrological Map of the Seine and Marne. The hydrological map of 

 the departments of the Seine and Marne is on a scale of 100,000, and shows 

 the underground stores of water of the region of La Brie. These water 

 supplies are represented by certain conventional colours, and their form has 

 been determined by the geological investigation of the subsoil, from surveys 

 and borings made over a network of wells. In fact, the surface represents the 

 sides which have been ascertained for each well below the level of the sea, 

 and these are shown by horizontal curves of 20 metres distance, so that it is 

 very easy to trace the course of the flow of the water supplies. 



In the region of La Brie, the principal subterranean water beds correspond, 

 with the most important argillaceous strata, that is to say, the green clays, 

 the plastic clays, and in certain points, the building limestones of La Beauce. 



Moreover the subterranean sheets of water known as those of infiltration 

 correspond to the various watercourses which traverse La Brie, and especially 

 the rivers, such as the Seine and Marne. 



