Contents* 



Causes which Determine the Climate of a Locality Continued 



7. The Degree of Cultivation of the Soil . . . . 363 



8. Prevailing Winds ........ 3 6 3 



9. The Quantity of Annual Rainfall ... . : 3 6 4 

 Controversy about the Tehuantepec Lands for Coffee . . 364 



Letter of October 15, 1893, from M Romero to the Editor 



of the India-Rubber World, of New York ' ,< . 364 

 Rubber Shade for Coffee Plantations . . ' . . . 365 

 Letter of October 30, 1893, to the Editor of the India- 

 Rubber World, by F. O. Harriman, in Response to 

 M. Romero's Letter . ;-. . . . . . 3 6 5 



Another Response to Senor Romero . . . . . 367 



Letter of November 9, 1893, to the Editor of the India- 

 Rubber World, by J. P. Harriman, in Response to M. 

 Romero's Letter . V ,. . . . '. . 367 

 An Answer from Senor Romero . . . . : . . . 367 



Letter of December 16, 1893, from Senor Romero, in 

 Response to F. O. and J. P. Harriman's Letters to the 

 Editor of the India-Rubber World . - , . . 367 



INDIA-RUBBER CULTURE IN MEXICO * 371 



Introduction . . . . . ... . . 373 



India-Rubber Culture in Mexico . . . . ...... . 377 



I. Introduction . . 377 



II. Description of the Rubber-Tree Botanical Name Chemi- 

 cal Analysis Specific Gravity of Rubber When Rubber 



was First Used Vulcanized Rubber ... . 378 

 III. Importance of Rubber as a Raw Material . . . .381 



IV. Profits of the Culture of the Rubber-Tree . . . . 382 



V. Proper Conditions to Form a Plantation of Rubber-Trees 383 



1. Climate and Land Best Adapted to the Culture of the 

 Rubber-Tree . . . . . . '..-- 3 8 5 



2. How to Form a Plantation of Rubber-Trees . . . 386 



3. The Rubber-Tree must be Planted in the Sun . ,* 3 8 & 



4. Distance Needed in Planting Rubber-Trees ... 389 



5. Care Required for the Culture of the Rubber-Tree . 389 



6. Time Required for the Tree to Produce Rubber . . 390 



7. Quantity of Rubber that Each Tree can Yield . .391 



8. Method of Extracting Rubber without Destroying the 

 Tree . . . . . 39 2 



VI. Probable Cost of a Plantation of Rubber-Trees . . -393 



