...to me of a remarkable nature. This red ray appears to possess a definite refrangibility, and to.be characteristic of the salts of potash, as the yellow...detected with a prism. If this should be admitted, 1 would further suggest, that whenever the prism shows & homogeneous my of any colour to exist in a...

...pointing out the fact that in inquiries like this an achromatic telescope is not necessary.] racteristic of the salts of potash, as the yellow ray is of the salts of soda. If this should be admitted, I would further suggest that whenever the prism shows a homogeneous ray...

...of nitre and sulphur, he observed a red ray of low but definite refrangibility, which he regarded as characteristic of the salts of potash, as the yellow ray is of the salts of soda. He concludes his paper with the following observation, which follows some remarks upon some experiments...

...of nitre and sulphur, he observed a red ray of low but definite retrangibility, which he regarded as characteristic of the salts of potash, as the yellow ray is of the salts of soda. He concludes his paper with the following observation, which follows some remarks upon some experiments...