54 ES-SAYS AND OBSERVATIO>rs 



cortfiitution of thefe different lights with a 

 piifm, (holJing the refracting angle upwards) 

 and found, that, in the frrlt cafe [N° 25.], 

 when fal ammon. alum or potafli fell into- 

 the fplrits, all forts of rays were emitted, but 

 not in equal quantities ; the yellow being 

 vafcly more copious than all the reft put 

 together, and red more faint than the green 

 and blue. 



28. In the light of fpirits mixed with nitre 

 or fea-falt, I could ftill obferve fome blue, 

 tho' excellivcly weak and diluted : with the 

 latter, the green was equally faint ; but, 

 with the former, pretty copious. But, when 

 either of thefe falts were ufed, I could hardly 

 fee any veftige of the red at all, at lead 

 when they were poured /;/ plentifully, and 

 the fpirits conftantly agitated. At every 

 little intermiffion indeed the red rays would 

 iliovv themfelves very manifeftly below the 

 hole, and red bodies feen by that light re- 

 fumed fomewhat of their ordinary colour : 

 and it was very entertaining to obferve how 

 both would evanifti again at once, as foon as 

 the faking and flirring were renewed. 



The proportion in which the bright 

 yellow exceeds the other colours in this light, 



is 



