SPECTRUM OF THE SUN AND ELEMENTS.


The _Johns Hopkins University Circular_, No. 85, issued in February,
contains Prof. Rowland's report of progress in spectrum work. The
spectra of all known elements, with the exception of a few gaseous ones,
or those too rare to be yet obtained, have been photographed in
connection with the solar spectrum, from the extreme ultra-violet down
to the D line, and eye observations have been made on many to the limit
of the solar spectrum. A table of standard wave lengths of the
impurities in the carbon poles extending to wave length 2,000 has been
constructed to measure wave lengths beyond the limits of the solar
spectrum. In addition to this, maps of the spectra of some of the
elements have been drawn up on a large scale, ready for publication, and
the greater part of the lines in the map of the solar spectrum have been
identified. The following rough table of the solar elements has been
constructed entirely according to Prof. Rowland's own observations,
although, of course, most of them have been given by others:

_Elements in the Sun, arranged according to Intensity and the Number of
Lines in the Solar Spectrum_.

According to intensity. According to number.

Calcium Zirconium Iron (2,000 or more) Magnesium (20 or more)
Iron Molybdenum Nickel Sodium (11)