352 



Scientific Intelligence. [No. 8, new series. 



in the sun also fell, though very little. Evidently the instruments 

 had gradually surrounded themselves with a stratum of heated air, 

 corresponding with the temperature of the mercury, which, during 

 the periods of stronger wind, was removed, and replaced by one 

 less hot. 



The readings were 



At 1-42 p. m 82° 60' Centigrade. 



Wind increasing very much at 1-44 p. m. 



Thermometer at 1-46 p. m 78° 74' „ 



It rose again, in a slight lull, from l c 53' to 2° 10' „ 

 It stood at 2-10 80° 45' ; then the wind setting in again, it gra- 

 dually sank, and soon (2-35) disappeared below the divided scale. 



At Allyghur, April 17th, the day was particularly clear; the 

 West wind hot, but not very strong. Here I found the highest 

 temperature I had till now observed, viz. 90° 30' C. or 194° 54' F* 

 the time of this maximum, 1-20 p, m., coinciding very nearly with 

 the observation at Benares. 



I was enabled to compare my instrument with one used by Mr. 

 Gubbins,fthe bulb of which was protected against lateral radia- 

 tion, by being enclosed in a double cylinder of glass. The two 

 instruments agreed, at least for the maximum, better than might 

 have been expected. The time of the maximum was, naturally, 

 not so well denned in the one enclosed in the glass tube, as in the 

 other laying on wool : the former was slow to cold before the 

 period of its maximum, to warm afterwards. The readings were 

 on April 3rd — 



* Corrected as the following for index error. 



f We are deeply indebted to Mr. and Mrs. Gubbins for the communi- 

 cation of a series of most accurate meteorological observations, which not 

 only embraced the ordinary objects of observation, but in which, at the 

 same time, a great variety of experimenU were combined with equal skill 

 and ingenuity. 



