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POPULAR SCIENCE REVIEW. 
the same change as is to be expected on a hypothesis of the non-elementary 
character of the elements is found to take place. Thus each salt of calcium 
below a certain temperature has a spectrum of its own, but as this rises, fine 
lines due to the metal appear in the blue and violet. In the electric arc the 
violet H and K lines are still thin. In the sun they are very thick. Both 
are present in a Aquilse, the latter only half the breadth of the former. In 
a Lyra and Sirius only the H line of calcium is present. In solar storms, 
the H line has been seen injected into the chromosphere seventy-five times, 
the K line fifty times, but the blue line, which is the all-important line of 
calcium at the arc-temperature, was only injected thrice. 
Iron and lithium exhibit analogous changes. 
As regards hydrogen, its most refrangible line h is only seen with very 
high temperature ; it was absent from the solar protuberances in the eclipse 
of 1875. By employing a very feeble spark at low pressure, the F line of 
hydrogen in the green is obtained without the blue and red lines seen when a 
stronger spark is used. 
Mr. Lockyer has obtained evidence leading to the conclusion that the sub- 
stance giving the non-reversed line in the chromosphere, termed Helium, and 
not previously identified with any known form of matter, and also the sub- 
stance giving the 1474 or coronal line, are really other forms cf hydrogen, 
one more simple than that which gives the h line alone ; the other more 
complex than that which gives the F line alone. 
The Music of Colour and Motion. — Profs. Ayrton and Perry read a 
curious if somewhat fanciful paper on this subject before the Physical 
Society on Nov. 23. They began by assuming that emotion is excited by 
moving bodies, and expressed their belief that upon this basis a new 
emotional art would be created which would receive high development in 
the future. All the senses they believed could be cultivated into emotion. 
One of these, music, from the facility with which its effects could be pro- 
duced, had alone been highly perfected by the bulk of mankind. Sculpture 
and painting they held to be not purely emotional, inasmuch as they 
involve thought. It would take long time and culture for the eye to behold 
moving figures with similar emotional results to those produced through the 
ear on hearing music. Indeed the Eastern nations seemed to have culti- 
vated this faculty more highly than those of the West. The Orientals had 
entertainments consisting of motion and dumbshow which, though incom- 
prehensible and even ludicrous to the European, powerfully affected the 
feelings of a native audience. In Japan they had seen whole operas of 
“ melodious motion ” expressed by movements and gesticulations of the body- 
In illustration, Blackburn’s pendulum, Lissajou’s forks, Wheatstone’s 
Kaleidophone, Yeates’ vibrating prisms, Donkin and Tisley’s harmonographs, 
and other like contrivances were exhibited. In none of these, however, is 
the production of mere emotion the end in view. A successful instrument 
in the new kinematical art must at least visibly render changes in period, 
amplitude, and phase. Such an instrument they had devised and con- 
structed in Japan, and it was described by means of diagrams and photo- 
graphs. As far as could be thus made out, it appeared to be an ingenious 
contrivance for producing and modifying compound harmonic motion. They 
intend constructing an improved form of the apparatus, and to arrange for 
