393 



REPORT 18GG. 



The temperature of thu air declined from 5S°'0 on the ground to 52° at 

 2000 feet, and somewhat more rapidly to 4(P~ at ."5000 feet ; it increased to 

 4S^-7, or by 2° in the next 40(1 feet, and then gradnnlly declined to 2U°-8 at 

 the height of 620l» feet. On descending:, the temperature increased £i:radually 

 to -iS°-3 at 1000 feet, and then much more rapidly to 5n°-() at the height of 

 500 feet : this rapid increase was remarkable. On turning to ascend the sun 

 having set, the temperature declined pretty e(iually to the height of 4000 

 feet, and at greater heights, with somewhat less regularity, to 34° at GOOO 

 feet, when the temperature increased to ;55°-3 at the height of G400 f( et : 

 this increase was very remarkable. On descending again, the temperature 

 increased with moderate regiilarity to 48°- 7 at the height of 1300 feet, and 

 then ^^'ith much greater rapidity to 53°-8 at the height of GOO feet, A\hen 

 the increase was arrested, and the temperature at lower elevations rajiidly 

 doclined, on approaching the earth, to r>u°-\. 'Jliis decli)ic uf temperature 

 from Gi»0 feet is remarkable. Ey conqjaring the readings at tlie same heights 

 before and after sunset, it will be seen tliat at the height of GiXM) loet, the 

 temperature was from .3° to 0° warmer after sunset than it A^■as before sunset, 

 and that tlu' (emperatures on the ground, and at liHiO feet high, were nearh' 

 the same, whilst at intermediate heiglits llicy were much higher. 



Table VI. — Showing the Decrease of Temperature a\ ith every increase of 



100 feet up to 0400 feet. 



