CLIMATOLOGY OF RAIN-FOREST REGION. 



11 



mum for New Haven Gap is 83 in July 1889, and the absolute mini- 

 mum 40.5 in January, February, and April 1888. Not only are the 

 averages of the monthly absolute maxima and minima unsatisfactory 

 data from which to determine the temperature conditions for a locality, 

 but the fact that these figures do not cover the same years in the case 

 of New Haven Gap as for the other localities invalidates too close com- 

 parison of them. The more exposed position of New Haven Gap on 

 the Main Ridge, as compared with Cinchona, will account for its 

 greater range of temperature, the difference in altitude being but 600 

 feet. Between New Haven Gap and Blue Mountain Peak there is a 

 greater difference in altitude (1,828 feet, 555 meters); while the tem- 

 peratures range lower at the latter place the annual and daily ranges 

 are probably nearly the same. 



TABLE 1. Monthly mean temperature data for Cinchona, 1891 to 1905. 



Annual mean temperature 60 . 8 (16 . C.). 



Annual mean range 5.3 (2.9 C.). 



Average daily range 12.0 (6.6 C.). 



TABLE 2. Monthly absolute maximum and minimum temperatures at Cinchona, New 



Haven Gap, and Blue Mountain Peak. 



NOCTURNAL TERRESTRIAL RADIATION. 



Several observations were made on nocturnal terrestrial radiation, 

 with a view to determining what are the probable temperatures at the 

 surface of the ground at the time of some of the low minimum winter 

 temperatures. Ordinary thermometers were laid on a grass sod or 

 lightly covered with earth on a flower bed; another thermometer was 

 placed 3 feet from the ground and compared with a standard ther- 

 mometer in a Stevenson screen. 



