BENEVOLENT FUND. 
605 
easily intelligible: carbonic acid is generated and phosphate of the alkali is formed at 
the same time. The essential feature in Horsford’s invention is the economical getting 
of phosphoric acid in the shape of a dry white powder. This is done by taking bones, 
burning them, and then treating the well-burnt bone-earth (which consists of phosphate 
of lime and magnesia) with a certain quantity of sulphuric acid, so as to remove two- 
thirds of the lime and leave a soluble superphosphate of lime. The sulphate of lime 
which results from the action of the sulphuric acid is separated from the rest by filtra¬ 
tion, and the solution subsequently concentrated by evaporation, and, when it becomes 
very concentrated, mixed with a certain quantity of flour, and dried up. The mixture 
of flour with the superphosphate admits of being reduced to the finest powder, and con¬ 
stitutes the acid powder just referred to. It will be observed that the alkali-powder 
contains soda, whereas potash is required in order to furnish the right kind of mineral 
salts. Liebig proposes to rectify this defect by using a certain quantity of chloride of 
potassium along with the alkali. Chloride of potassium is now tolerably cheap, owing 
to the finding of immense quantities of it at Strassfurt. Baron Liebig, in order, as he 
says, to avoid being bothered, has appointed Herr Zimmer, of Mannheim, and Herr 
Marquart, of Bonn, his agents for his new baking powder; and those interested may, if 
they like, get it from them .—British Medical Journal , Jan. 2, 1869. 
POISONING BY PERCHLORIDE OF IRON. 
A case is recorded in the 1 Lancet ’ of January 2nd, in which a lady aged thirty had, in 
a fit of passion, caused by a quarrel with her husband, swallowed the contents of an 
ounce bottle of tincture of perchloride of iron. She was seized with violent convulsions. 
Sulphate of zinc emetics were given in the intervals of the spasmodic attacks, under 
which treatment she ultimately recovered. The symptoms of irritant poisoning were 
attributed to the free hydrochloric acid present in the tincture. 
THE CHEMISTS’ ASSISTANTS’ ASSOCIATION. 
14, Air Street, Regent Street, W. 
Established April, 1864. 
The following are the arrangements for the reading of papers, eighth series, continued, 
from March to July, 1869 :—April 1, “ Disinfectants,” Mr. Cottrill; April 8, “ Ozone,” 
Mr. Stiles; April 15, “ Guano,” A three months’ resident at the Chincha Islands; 
April 22, “Oxide of Zinc,” Mr. Jewell; April 29, “ Sugar,” Mr. Pickering; May 6, 
“ Cinchona Barks,” Mr. Weaver; May 13, “ Communication,” Mr. Green; May 20, 
“ The Philosophy of Food considered in relation to Liebig’s Theory of Life, Health, and 
Disease,” Mr. Willmott; May 27, “Medicinal Lozenges,” Mr. T. H. Hall; June 3, 
General Meeting, chair by Mr. Sands; June 10, “Taraxacum,” Mr. Moyle; June 17, 
“ Sewage Question,” Messrs. Jewell and Beynon; June 24, “ The Advantages of Early 
Closing,” Mr. Shann. 
BENEVOLENT FUND. 
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