MODELS AND MAPS 



rise another 100 feet. Again there would be a new shore-line 

 within the others, including a still smaller area of the country. 

 This might also be marked on the map, and called the contour 

 of 200 feet. Further successive submergences to the same 

 extent might be imagined, and each time the contour-line drawn. 



FIG. 43. Portion of Fig. 39 to show the land which would remain above water 

 after a submergence of 600 feet. Compare Fig. 44. 



The country would become smaller and smaller with each sub- 

 mergence. The hills would become peninsulas, and then islands, 

 then the lower ones would be entirely submerged, and at last 

 no land at all would remain above sea level. On the other hand, 

 the valleys would successively become gulfs, straits, and seas 

 during the stages of submergence. (Compare Figs. 41, 42, and 43, 

 with 39 and 44.) 



VOL. VI. IO 



