The National cyclopædia of American biography : being the history of the United States as illustrated in the lives of the founders, builders, and defenders of the republic, and of the men and women who are doing the work and moulding the thought of the present time, edited by distinguished biographers, selected from each state, revised and approved by the most eminent historians, scholars, and statesmen of the day . ),with which the U. 8. treasury notes were printedduring the civil war, and from its use they derivedthe name of greenback currency. This ink hassince been extensively used for oth
The National cyclopædia of American biography : being the history of the United States as illustrated in the lives of the founders, builders, and defenders of the republic, and of the men and women who are doing the work and moulding the thought of the present time, edited by distinguished biographers, selected from each state, revised and approved by the most eminent historians, scholars, and statesmen of the day . ),with which the U. 8. treasury notes were printedduring the civil war, and from its use they derivedthe name of greenback currency. This ink hassince been extensively used for other commercialpurposes besides the printing of bankbills. He mademore exhaustive researches, both synthetic and ana-lytic, into the chemistry of soda and mineral watersthan any chemist of his day ; he made a thoroughstudy of the chemistry of lime and magnesia, withreference to the origin of the native combination ofthese bases, and also made valuable contributions tochemical cosmogony, and to the theory of chemicaland dynamical geology. The extended researchesof -Dr. Hunt into the salts of lime and magnesia are,after long years, finding recognition among geolo-gists ; through studies he established for thefirst time the true relations of gypsums and dolo-mites, and explained their origin by direct deposi-tion. He made a thorough investigation of petroleum,both from a and geological standpoint;. J • 0 UoAu l^TUVL. discussed the phenomena of volcanoes and igneousrocks from a new light, and brought to light andestablished the hypothesis of Keferstim, that theirsource is found in chemical reactions; and was firstto explain the relation between modern volcanicphenomena and large accumulations of recent sedi-mentary formation, and the nature of such relationswith folded or contorted strata. His ideas on thesesubjects may be found in his paper, The Chemistryof the Earth, in the Smithsonian report, 1869. Hehas also made numerous contributions to chemistryand geology r
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