WEATHERS: ELECTRICAL DISTURBANCES 91 



thrown upon clouds at an angle (correct ?) 

 of forty-five degrees. This cast a reflection 

 upon a river twelve miles off. The river 

 was the Opihi. Trout had been rising freely 

 to an angler's lures up to the time (to the 

 moment) the glare came upon the water, 

 and then they suddenly ceased. Similar 

 effects had been observed under similar cir- 

 cumstances on other rivers of New Zealand. 

 From this it may appear that the effect upon 

 trout may be less caused by any direct atmo- 

 spheric causes, such as atmospheric pressure, 

 than by simple lights and colour-effects. 



The angle of reflection need not necessarily 

 be equal to the angle of incidence, as the 

 surface of the cloud may or may not be a 

 horizontal reflecting plane. And, under vary- 

 ing directions and circumstances of the wind- 

 drift across the sun and the formation of the 

 clouds, or at night across the sky and moon, 

 so will these combined effects of light vary, 

 whether natural or artificial. Hence the 

 varieties of weathers, lights, and effects which 

 we endeavour to describe further on. 



Thus, according to whether the plane of 

 the reflecting surfaces be horizontal, as in 



