xl 



INTRODUCTION. 



do not correspond : while the one above passed through a range of 

 27, the one below changed but 13. 



The observations made with a view of determining the height in 

 feet due to each degree of temperature during our stay at the summit 

 and at the station we occupied on the mountain side, are given in the 

 following table ; these results, it will be seen, vary in consequence of 

 the range of temperature being so much greater at the upper stations 

 than at the lower, which must affect them according to the hour in 

 which the observations are made. If the means are to be taken at 

 the maximum hours, the result will be too great, and if at the mini- 

 mum hours, too little, and it also appears that the localities have 

 their influence. 



On Haleakala (Maui), at 10,143 feet elevation, observations made 

 at 2 P.M., gave 338 feet; at a station, Drayton's Cave, 8,600 feet high, 

 we get 318. feet at the same hour. The height due to a decrease of 

 one degree in the boiling point of water, at the above places was 537 

 to 550 feet. Mean solar radiation, sun, 110, shade 82, difference 28. 



The following table exhibits corresponding observations made with 

 the photometer and setherioscope of Leslie, from the 4th to the 9th 

 January, at the summit station. 



