^NATIONAL 



CEOGRAPHIC 

 MAGAZINE 



-A 



Vol. xvn 



JUNE, 1906 



CONTENTS 



No. 6 



PAGH 



Cotidal Lines for the World. With Map. By R. A. 



Harris 303 



Where the Wind does the Work. Illustrated. By 



Collier Cobb 310 



The Eruption of Mount Vesuvius, April 7-8, 1906. 



Illustrated. By Thomas A. Jaggar, Jr. . . . 318 



Illustrations of Damage by the California Earthquake 325 



The Diamond Mines of South Africa. Illustrated. 



By Gardiner F. Williams 344 



Canadian Immigration 356 



The Luray Caverns. Illustrated . . . . . 358 



Notes on the Panama Canal 362 



Published by the National Geographic Society 



Hubbard Memorial Hall 



Washington, D. C. 

 $2.50 a Yeaf 25 Cents a Number 



Entered at the Pott-Ofllce In Washington, D. C, ae Second-Class Mail Matter 



