October 5, 1883.] 



SCIENCE. 



461 



Relative humidity. 



to Color.i(.lo as a resort for invalids. It has 

 been seen tliat most authorities favor a cold 

 climate ; but the}- add the proviso that it 

 should be free from change. B}' consulliiig 

 table VI., part ii., it will be seen that the mean 

 monthly range of temperature is larger for 

 Denver than for almost an}- other point in our 

 scale. It will be seen, further, that the minima 

 (table VI., part i.) of temperature are very 



nearly the lowest in the scale, — not so low,, 

 to be sure, as the minima at St. Paul, but de- 

 cidedly lower than at Augusta, Jacksonville, 

 and Los Angeles. This state of affairs de- 

 mands an explanation. 



AVe have seen that the air of Colorado is 

 both dry and rare, — two conditions that favor 

 rapid radiation. "V\'e have seen, further, that 

 the soil is of a porous, sandy nature, — a kind 



TABLE v. — WiBDS, 1880. 



