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Nessler's opera, 'Der Trompeter von Säkkingen, is still one of the most popular works in the repertory of German opera-houses, and his 'Rattenfänger von Hameln' is scarcely less of a favourite.
Nessler's reagent is the most delicate, a reddish-brown colour or precipitate being produced, but ammonia may be recognized by its pungent odour, dense fumes given off with hydrochloric acid, and strong alkaline reaction. Treatment. Vinegar and water. Other treatment according to symptoms. Fatal Dose. One drachm of strong solution. Four minutes.
It is also known that some of these acids, which were called long ago by Thenard azohumic, are enabled to dissolve colloid silica in proportion to the nitrogen which they contain. In the formation of these latter acids worms probably afford some aid, for Dr. H. Johnson informs me that by Nessler's test he found 0.018 per cent. of ammonia in their castings.
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