Photometric ObservAtims of ilic Sun and Sku. 



279 



present some haze, visible or invisible, that affects the readings of 

 the chemical action on sensitised paper very largely, even to 50 per 

 cent. 



The octant observations, the intensities estimated on the first of 

 the above strips, are as follows : 



Table K. 



The values of [V] = [W], being so much greater than I expected, 

 me to imagine that, though the sky was apparently clear, the 

 observations might have been affected by the hygrometric state of 

 the atmosphere. There had been a fog in the morning, and the air 

 ras, though translucent, saturated all the afternoon. 



The next day, the 14th October, was a similar day (fog in the 

 loruing), and I commenced octant observations much earlier in the 

 dng. The results are given in the following table : 



Table L. Octant Observations, 14th October, 1890. 



