I. On the new gas obtained from uraninite. Second note

Since my communication on the gas obtained from uraninite (bröggerite) was sent into the Society, on the 25th ultimo, I have been employing the method I there referred to in several directions, among them to determine whether the spectrum of the gas indicates a simple or a complex origin. I was led to make this special inquiry on account of the difference in the frequency of the appearance of D3 and the other lines to which I referred in the previous communication in the solar chromosphere. For instance, if we take the lines D3 , 4471, and 4302, the frequencies are as follows, according to Young:—