Ohservatlons on the Annular Eclipse. 



135 



The following table exhibits the results of the observations :— 



From this table it will be seen, that so soon as the sun began to 

 be concealed, the instrument indicated a perceptible diminution 

 of light, and that its readings followed very closely the progress 

 of the eclipse. The transparency of the air, however, was sub- 

 ject to considerable fluctuations, the effects of which are percep- 

 tible on the numbers. After the greatest obscuration the indi- 

 cations rise, but not with a rapidity equal to that of their de- 

 scent, for this reason, that as the sun was getting lower, his rays 

 had to traverse a greater thickness of atmosphere. 



The diminution of heating power, as shewn by the photometer, 

 was 129° of its scale, that is, 12°.9 of the centigrade thermome- 

 ter, or 9S\ of t)>e common Fahrenheit thermometer. 



Instructionsjbr Making and Registering Meteorological Obser^ 

 vations at various Stations in Southern Africa and other 

 Countries in the South Seas, as also at Sea.* 



The great importance of possessing an exact and carefully 

 registered account of the variations of the barometer, thcrmo 



* Drawn up for circulation by the Meteorological Committee of the South 

 African Literary and Philosophical Institution ; we believe by Sir John 

 Herschel. The "Instructions" are printed in No. 1. of Second Series of 

 the South African Quarterly Journal, sent to us by our friend Dr Adamson 

 of the Capa 



