. Scientific American Volume 97 Number 16 (October 1907) . -mercial value. As already stated, at the moment itis purely in its experimental stage, the plant havingonly been in working order for just about a month,too short a period for one to predict likely the same time, it is an experi-ment which will undoubtedly befollowed with the greatest in-terest. The Two Plants on the Right Have Been Stimulated into a Vigorous Growth by Electric Rays. an atmosphere containing moisture and carbondioxide in the proportion common to most fertilecountries; (4) a temperature within the limits of7
. Scientific American Volume 97 Number 16 (October 1907) . -mercial value. As already stated, at the moment itis purely in its experimental stage, the plant havingonly been in working order for just about a month,too short a period for one to predict likely the same time, it is an experi-ment which will undoubtedly befollowed with the greatest in-terest. The Two Plants on the Right Have Been Stimulated into a Vigorous Growth by Electric Rays. an atmosphere containing moisture and carbondioxide in the proportion common to most fertilecountries; (4) a temperature within the limits of70 and 80 deg. Fahrenheit; (5) an ideal fertilizingagent; (6) an ample supply of water for the is also the inventors contention that the appa-ratus is an economical one. It is expected that thefigures will show a saving of thirty per cent overall systems at present employed. Indeed, it is claimedthat the whole cost of the apparatus and its workingcomes out in the end at the rate of two cents, as atpresent compared with six cents per hour. Then it. The Rear Side of the Light. A Remarkable AcousticPhenomenon. An interesting acoustic phe-nomenon called, in Italy, bron-tidi, has been investigated byProf. T. Alippi, of the meteoro-logical and seismical observatoryof Urbino, Italy. These brontidiare mostly hollow noises, resem-bling the echo of a distant explo-sion, and are usually observedwith a bright sky and calm air,occurring rather seldom in windyor rainy weather. They usuallyoccur in the afternoon, both inwinter and summer. These noiseswould seem to be of atmosphericorigin. They do not produce anyphysiological effects of their own,nor do they seem to be connectedwith local earthquakes, thoughthey sometimes cause windowpanes to vibrate. They are nearlyeverywhere considered as presageof bad weather, and are popularlysupposed to be due to strong tides or storms at sea,whose echoes are transmitted to a distance. has obtained his results by means of a circularlet
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