APPENDIX. 



In my book on the State of Oaxaca, I published some facts about 

 the causes which affect the climate of that place which I intended to 

 use when I could make a revised edition of my paper on Coffee. But 

 as that is not possible, I think it would be prudent to insert here that 

 memorandum which I think will be of some value to anyone attempt- 

 ing to go into coffee-planting. 



The India- Rubber World, of New York, of August 15, 1893, pub- 

 lished a letter of Mr. F. O. Harriman, Civil Engineer, dated at Jaltipan, 

 in the State of Veracruz, recommending the lands of the Isthmus of 

 Tehuantepec as very well suited for coffee and india-rubber culture. 

 As I was afraid that Mr. Harriman's views were not well grounded, I 

 wrote on September 25, 1893, a private letter to Mr. Hawthorne Hill, 

 the editor of that paper, pointing out what I considered serious mis- 

 takes in Mr. Harriman's paper, so that he could correct them editorially 

 if he thought proper to do so. Mr. Hill answered me that the best 

 way to accomplish that end was to publish my letter, and requested my 

 permission to do so, and thinking it might do good to discuss through 

 the press the subject to which my letter referred, I consented to its 

 publication, and it did appear in the issue of The India-Rubber World 

 for October 15, 1893. Both Mr. Harriman, from Jaltipan, and his 

 brother, Mr. J. P. Harriman, from Woonsocket, Rhode Island, answered 

 my letter, and I had to write a rejoinder, which put an end to the con- 

 troversy. In compliance with the intimation I made in the foot-note 

 which appears on page 295 of the foregoing paper, I append the letters 

 published on the subject. 



CAUSES WHICH DETERMINE THE CLIMATE OF A LOCALITY. 



The climate of any locality consists in the combination of its tem- 

 perature with the humidity that prevails there. The sun is the source 

 which sends forth heat to the surface of the earth ; when the sun is 

 over the horizon of any locality, that locality receives heat, and when 

 it is below the horizon, that same locality is losing heat through irra- 

 diation. 



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