An Introduction to Physical Geography 



2 5 



From Gilbert'sand Brigham's " Introduction to Physical Geography." D. Appleton & Co. 



Figure 4. — The Last House in Riggs, Oregon, a Village Overwhelmed by 

 Dunes. Attempts to hold the sand back by fences were unsuccessful 



soft, of which almost every mountain is 

 made. 



Figure No. 4, an example of wind 

 work, shows a substantial house in Ore- 

 gon nearly buried by drifting sand. 

 In Chinese Turkestan, Sven Hedin has 

 recently discovered the ruins of great 

 temples where flourished 2,000 years 

 ago cities with a high degree of culture 

 and civilization. Here in the heart of 

 Asia populous cities and lakes have 

 been buried beneath drifting dunes. 



Figure No. 5 shows how some of the 

 people of Cape Cod, Massachusetts, 

 check the advance of the sand by plant- 

 ing grass, which binds the sand and keeps 

 the wind from lifting it. Common olean- 

 ders are used for this purpose in Ber- 

 muda. Where no effort has been made 

 to check its advance, a dune has been 

 known to migrate as much as 70 feet in 

 one year. 



The authors of "An Introduction to 

 Physical Geography ' ' are very well 



From Gilbert's and Brigham's "Introduction to 

 Physical Geography." D. Appleton & Co. 



Figure No. 5. — Planting Grass to Stop 

 the Drifting of Sand, near Province- 

 town, Cape Cod, Mass. 



