ABOUT THE 20TH OF DECEMBER, 1836. 163 



grown to an unexpected length, I reserve my remarks upon that point to 

 some future opportunity. I trust it will not be inferred from my silence with 

 respect to the labours of others in this important field, that I am wholly igno- 

 rant of them, or am insensible of their value. I have availed myself of the 

 labours of others as far as was in my power. To have credited every sugges- 

 tion to its original author would have been inconvenient, and generally super- 

 fluous, being found in most treatises on meteorology. I am happy, however, 

 to express my particular obligations to the labours of Messrs. Redfield, Espy, 

 and Col. Reid, and shall esteem myself well repaid if the present communica- 

 tion shall contribute something to the progress of that science which they have 

 done so much to promote. 



