Bacteria can process toxic wastes and oil spills into harmless biodegradable materials.
On the toxic properties of nickel salts see A.
But every antiseptic, however good is more or less toxic and irritating to a wounded surface.
In large doses toxic symptoms are produced, death following on coma.
The methods used in the investigations were, however, open to objection, and it is now recognized that although organic bases may sometimes be formed, and may be toxic, the important toxins are not of that nature.