Huxley, who in the 9th edition of this encyclopaedia traced the history of the growth of the biological idea of evolution from its philosophical beginnings to its efflorescence in Charles Darwin.
The manufacture of glass, also practised in Egypt, demanded a knowledge of sodium or potassium carbonates; the former occurs as an efflorescence on the shores of certain lakes; the latter was obtained from wood ashes.
Wall-saltpetre or lime saltpetre, calcium nitrate, Ca(N03)2, is found as an efflorescence on the walls of stables; it is now manufactured in large quantities by fixing atmospheric nitrogen, i.e.
Another defect arising during curing and fermentation is the efflorescence of salts on the surface, a phenomenon known as " saltpetre "; light brushing and spraying with a weak solution of acetic acid are effective remedies.
The efflorescence of aboriginal pottery is to be found in the Pueblo region of south-westernUnited States, in Mexico, Central America,Caribbean Islands, Colombia, Ecuador, Peru and restricted areas of eastern Brazil.