Metallurgical spectrum analysis with visual atlas.

Table of arc spectrum lines arranged in order of wave length.

" This is clearly the time to show a glass prism and to let these children make rainbows for themselves, to tell the story of Iris, and to use any colour material, Milton Bradley spectrum papers, Montessori silks, colour top, and anything else so long as the children keep up their interest.

I was trying to find out if the rays of different colours in the spectrum travel at the same rate.

The Johns Hopkins University Circular, No. 85, issued in February, contains Prof. Rowland's report of progress in spectrum work.

Fish of a score of shapes and of all colors of the spectrum wove in and out the branches and caverns of this wondrous parterre.