Biographical Notice of the Abbe Hauy. 9 



After Hauy had published this great work, he devoted him- 

 self to the composition of a treatise on natural philosophy for 

 the use of t! French National Lyceum, a task which he ex- 

 ecuted with i - .erable success. This work appeared in 

 1803 under the idle of Traite Elementaire de Physique, in 

 2 vols. 8vo., and was translated into English in 1807, by Dr 

 Olinthus Gregory of Woolwich. 



The impulse which Hai'iy had given to mineralogy was, in 

 a few years, propagated over all Europe. Communications 

 were m tie to him from every quarter, and many new min- 

 eral species were discovered. A new edition of his work, 

 therefore, became necessary, and after twenty years labour he 

 was enabled to complete it a short time before his death. 

 In this edition, which appeared in 1822, the Crystallogra- 

 phy was published separately in 2 vols. 8vo., while the 

 Treatise on Mineralogy occupied four 8vo volumes, with a 

 volume of plates. Besides these works, Hauy was the author 

 of the Tableau comparatif des Resultats de la Crystallogra- 

 phie et de V Analyse Chimique, which appeared at Paris in 1809, 

 of the Traite des Caracteres Physiques des Pierres Precieusec, 

 pour servir a leur determination lorsquelles He tailles, Paris 

 181 7, and of many valuable memoirs on the theory of crystall- 

 ization, and on the forms and characters of individual minerals 

 which were published in the Memoires de VInstitut, Roster's 



specie*. Rome de l'Isle w as particularly regardless of the two great points, 

 which, according to Linnams, like the thread of Ariadne, lead us through 

 the maze of the variety of nature— the systematic disposition and deno- 

 mination of the species; although, in his paper Des Caracteres Extiri- 

 eures des Mlneraux, he has given principles for the determination of the 

 latter, independent of chemical analysis, which will stand every attack, 

 and remain one of the most valuable disquisitions on the subject ever pro- 

 posed to the public, and which ought to be studied by every one who 

 wishes to inform himself on this important subject. Rome de 1 Isle was 

 the first to vindicate mineralogy to the province of natural history ; 

 against the pretensions of chemists, who, even at that time, when the 

 chemical knowledge of minerals was so imperfect, undervalued every 

 thing that was constant in minerals. This may account, m a great 

 measure, together with the neglect of those parts which have been pfker- 

 wards so highly improved by Haiiy, why Home de 1 Isle s works have 

 never had that degree of influence to which their excellence so justly en- 

 titled them." 



