94 REPORT—1845. 
atmosphere are changed into peroxides. Solutions of the alkaline bases, as 
potash, soda, baryta, &c., take up rather slowly ozone, producing peroxides. 
The hydrates of the protoxides of manganese, lead, cobalt, nickel, or silver, 
being attached to stripes of paper and suspended in an ozonized atmosphere, 
are rather-rapidly changed into the peroxides of those metals. Potash takes 
up ozone and water too. 
10. A solution of iodide of potassium is rapidly decomposed by being 
treated with ozonized air, iodine being eliminated. At the same time iodate’ 
of potash is produced, which production is however preceded by the forma- 
tion of a peculiar compound most likely consisting of iodide and peroxide of 
potassium. Hence it comes that paste of starch being mixed up with some 
iodide of potassium and exposed to ozonized air, instantaneously turns blue, 
and proves to be the most delicate test for ascertaining the presence of ozone. 
11. Crystals of bromide of potassium, put into paste of starch and exposed 
to the action of ozone, colour that paste orange-yellow. 
12. A solution of the yellow ferro-cyanide of potassium readily takes up 
ozone, yielding the red ferro-sesquicyanide. 
13. The white cyanide of iron, being exposed to the action of an ozonized 
atmosphere, is instantaneously changed into the blue one. 
14. The salts of the protoxides of iron and tin rapidly destroy ozone, and 
are transformed into peroxide salts. 
15, A great number of metallic sulphurets, being put in contact with ozo- 
nized air, lose their colour and are changed into sulphates; a piece of paper 
having been written over with a solution of acetate of lead and blackened by 
sulphuretted hydrogen, rapidly turns white within ozonized air. 
16. A number of organic substances, both of vegetable and animal origin, 
being placed within ozonized air, almost instantaneously destroy the odori- 
ferous principle; for instance, saw-dust, straw, ulmin, vegetable mould, albu- 
men, fibrine, caseous matter, and therefore blood, milk and common cheese. 
17. If ozonized air be caused to pass through a narrow tube into the open 
air, that current, of course, produces all the chemical reactions before men- 
tioned; but if part of the tube of emission is heated not quite red-hot, the 
peculiar smell of the current disappears at once, and along with it all the 
chemical and voltaic properties belonging to ozone. Its bleaching and po- 
larizing power, its capability of decomposing iodide of potassium, &c., are 
one. 
. 18. Common air, being as richly as possible charged with ozone, has a smell 
resembling very much that of chlorine, bromine and iodine; but if ozone is 
much diluted with common air, its smell cannot be distinguished from that 
developed near points of electrical emission. 
19. If common air, strongly charged with ozone, be inhaled only in mode- 
rate quantities, effects are produced similar to those caused by the respira- 
tion of chlorine, ¢. e, coughing, and an inflammation of the mucous mem- 
branes. Small animals put into richly ozonized air die very soon. I sawa 
mouse, which had been placed in a large bottle filled with strongly ozonized 
air, succumbing within the space of five minutes. As the quantity of the 
ozone which killed the animal must have been immeasurably small, it appears 
that this principle proves highly deleterious to the animal system. 
20. Chemically pure water, being acidulated by pure sulphuric acid or 
phosphoric acid and electrolyzed, yields oxygen charged with the same prin- 
ciple, which is produced when phosphorus acts upon common air; for that 
oxygen enjoys all the properties belonging to ozone engendered by the agency 
of phosphorus. ‘To obtain ozone by voltaic means, it is necessary that the 
acidulated water employed for that purpose be entirely free from any sub- 
ee ee 
