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POPULAR SCIENCE REVIEW. 
mere beginnings ; be arranged for a very extensive set of experiments to be 
made, so as to fix on a standard of comparison, but has not found time. 
Water Supply to the Vienna Exhibition. — This is given in the “ Journal 
fiir Gasbeleuchtung” No. 20, 1872, from which it appears that the total 
quantity of water to be supplied for all purposes, inclusive of fountains, 
driving of machinery, &c., amounts to 1,240 cubic metres per hour — a 
quantity sufficient for a population of 200,000. 
Death of Lieutenant Maury. — This distiaguished American physicist 
died at Lexington, Virginia, on the 1st February. He was the author of 
several works, among which may be mentioned the “ Physical Geography 
of the Sea,” and one on Navigation. He was astronomer to the South Sea 
Exploring Expedition under Commodore Jones, and was at one time in 
charge of the depot of charts and instruments, which served as a nucleus for 
the National Observatory and Hydrograph Office of the United States, of both 
of which he became superintendent. His labours in organizing the observa- 
tions as well as his investigations in connection with the winds and currents 
of the sea are familiar to all. The King of Prussia presented him with a gold 
medal, and the Emperor of Austria gave him the large gold medal of the 
Arts and Sciences as a recognition of his services. He has been living 
in retirement for some time. 
The Royal Society's Rumford Medal. — It seems that the Rumford Medal 
has been awarded to Anders Jonas Angstrom, For. Memb. R.S., for his re- 
searches on Spectral Analysis. The limitation in time attached to the ad- 
judication of the Rumford Medal compels the Council to connect this award 
with the latest of M. Angstrom’s published memoirs; but they are not 
insensible to the circumstance that this is but the termination of a long and 
valuable series. M. Angstrom’s researches generally are described with 
great clearness in the late President’s Address at the Anniversary Meeting 
of 1870. To the subjects there mentioned need only be added a mathema- 
tical theory of the Conduction of Heat. 
Professor Tyndall's Reception by the Royal Institution on his return from 
America. — At one of its March meetings the Royal Institution very properly 
passed a resolution congratulating Professor Tyndall on his safe return to 
England, and expressing satisfaction at the very admirable manner in 
which he had been received in America. The Institution had also to 
return Professor Tyndall its thanks for his generous gift of the splendid 
and elaborate apparatus which he had used during his lectures in America. 
The Americans have to thank the Professor, too, or rather they have thanked 
him, for his noble gift of the profits of his lectures as a fund to assist 
young Americans who proposed a scientific tour through Europe. 
Electric and Gas Lights are, we are informed by the ‘‘Times,” to be shortly 
exhibited from the clock-tower of Westminster. It is further proposed that 
the trial of the two shall be at the expense of the experimenters. The cur- 
rent in the electric will be generated by a comparatively novel and remark- 
able magneto-electric machine moved by steam power, which a high 
authority in this country pronounces to be a decided step in advance of 
every other machine of the kind. The latter is in operation at various 
lighthouses on the Irish coast, and may in favourable weather be seen at the 
distance of twenty-five miles. 
