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A DIFFICULT INVESTIGATION. 
Among the proposed scientific inquiries is the following 
one, full of interest, but very difficult of solution, we opine :— 
“To investigate the nature of the substances contained in the 
vapour produced by the respiration of man and animals in a 
state of health ; which is to be extended, if possible, to the 
substances exhaled in certain maladies, contagious ones 
especially, and this not only in reference to chemical analysis, 
but also an examination of their hurtful effects in different 
animals.” 
OZONE. 
In a letter to Professor Faraday, Schonbein writes—“ After 
many fruitless attempts at isolating ozone from an ozonide, I 
have at last succeeded in performing that exploit; and have 
also found out simple tests for distinguishing with the greatest 
ease ozone from its antipode, ‘antozone/ As the production 
of ozone by purely chemical means, the whole secret con¬ 
sists in dissolving pure manganate of potash in pure oil of 
vitriol, and introducing into the green solution pure peroxide 
of barium, when ozone, mixed with common oxygen, wfill 
make its appearance, as you may easily perceive by your 
nose and other tests. By means of the ozone so prepared, I 
have rapidly oxidized silver at a temperature of 20° C., and 
by inhaling it produced a capital ‘ catarrh /”—Philosophical 
Magazine . 
FATTENING PROPERTIES OF COD-LIVER OIL. 
A farmer of Haubourain (Nord) has just tried the experi¬ 
ment of accelerating the fattening of cattle by the use of cod- 
liver oil. The trial was first made upon two calves, eight 
sheep, and two pigs. The result surpassed all expectation ; in 
ninety days they were all in prime condition, the flesh being 
perfectly w'hite and of easy digestion. The quantity given 
was—to the pigs, sixty-three grammes (two ounces per day); 
to the sheep, thirty-one grammes. For the calves the oil was 
mixed with bran and chopped straw, for the sheep with 
bruised beans, and for the pigs with their regular food. 
