osed the
electronic theory of the origin of the complex ether vibrations which
proceed from a molecule emitting light.

John Tyndall (b. Leighlin Bridge, Co. Carlow, 1820, d. 1893), F.R.S.,
professor at the Royal Institution and a fellow-worker in many ways
with Huxley, especially on the subject of glaciers. He wrote also on
heat as a mode of motion and was the author of many scientific
papers, but will, perhaps, be best remembered as the author of a
Presidential Address to the British Association in Belfast (1874),
which was the highwater mark of the mid-Victorian materialism at its
most triumphant moment.

CHEMISTS.

Richard Kirwan (b. Galway 1733, d. 1812), F.R.S. A man of independent
means, he devoted himself to the study of chemistry and mineralogy
and was awarded the Copley medal of the Royal Society. He published
works on mineralogy and on the analysis of mineral waters, and was
the first in Ireland to publish analyses of soils for agricultural
purposes, a research which laid the foundation of scientific
agriculture in Great Britain and Ireland.

Maxwell Simpson (b. Armagh 1815, d. 1902), F.R.S., held the chair of
chemistry in Queen's College, Cork, for twenty years and published a
number of papers in connection with his subject and especially with
the behavior of cyanides, with the study of which compounds his name
is most associated.

Cornelius O'Sullivan (b. Brandon, 1841, d. 1897), F.R.S., was for
many years chemist to the great firm of Bass & Co., brewers at
Burton-on-Trent, and in that capacity became one of the leading
exponents of the chemistry of fermentation in the world.

James Emerson Reynolds (b. Dublin 1844), F.R.S., professor of
chemistry, Trinity College, Dublin, for many years, discovered the
primary thiocarbamide and a number of other chemical substances,
including a new class of colloids and several groups of organic and
other compounds of the element silicon.

Among others only the names of the following can be mentioned:--Sir
Robert Kane (b. Dublin 1809, d. 1890), professor of chemistry in
Dublin and founder and first director of the Museum of Industry, now
the National Museum. He was president of Queen's College, Cork, as
was William K. Sullivan (b. Cork 1822, d. 1890), formerly professor
of chemistry in the Catholic University. Sir William O'Shaughnessy
Brooke, F.R.S. (b. Limerick 1809, d. 1889), professor of chemistry
and assay master in Calcutta, is better known as the introduce