258 Life of Jofeph Toaldo. 



liflied, together with annotations and a preface. This edi- 

 tion contained alfo the celebrated dialogues refpefting the 

 fyfteni of the world. As one of the mafters of the above 

 feminary, he taught grammar, rhetoric, philofophy, and 

 mathematics; and here he fir ft introduced the infinitefimal 

 calculus according to the principles of his preceptor Suzzi, 

 one of the moft c'elebrated analyfts of Italy. His fervices to 

 this eftablifhment were foon rewarded by the archbifliop with 

 the benttlce of Montegalda, which he enjoyed for fourteen 

 vears. Though this place engaged a great deal of his atten- 

 tion, it allowed him fufficient Icifure for continuing his ma- 

 thematical ftudies, which, on account of the different occu- 

 pations of his academical office, he had not been able to 

 purfue with that attention which he wilhed. He however 

 exchanged this benefice for another more convenient, after 

 he had been invited by the fenateof Venice, in the year 1762, 

 to take upon him the vacant profeflbrfliip of aftrononiy and 

 meteorology in the univerfity of Fadua. 



In this^infiitution he found it neceflary to make a great 

 many changes in order to render his inftruftion ufeful. The 

 firft thing to be done, according to the fyftem which he pro- 

 pofed, was to cre6l an obfervatory. The curators of the uni- 

 , verfity complied with the requell which he made on this fub- 

 jeft, and intruftcd to him the care of drawing up the plan 

 and luperintcnding the conflruftion of the building. On 

 this account he undertook a tour through Italy for the pur- 

 pofe of inrpcfting the principal obfervatories, that he might 

 be better able to devife a plan for that of Padua. The 

 foundation of this obfervatory was laid in the year 1767, and 

 in 1774 it was completed. He now procured an excellent 

 quadrant from England, which he employed for making ob- 

 fervations in conjunftion with his nephew and afliltani Chi- 

 minello. To fupply the want of good elementary books he 

 publilhcd a fliort view of plane and fpherical trigonometry, 

 with tables, under the title of Tavole Trtgonometriche, con 

 una Intr-oduzwne, que contiene un Covipcndio di Trigonemetria 

 piiiria efpherica, applkata alia Pratica, an violte altre Tavole, 

 Padua 1769. 4to.; which was afterwards reprinted and in- 

 troduced into many of the Italian fcminarics. 



This work was foon followed by another on the influeoce 

 of the heavenly bodies on the weather and aimofphere ; which 

 greatly contributed to extend his fame as a philofopher, and 

 which contained the refult of a long feries of meteorological 

 obfcrvations iriadc bv him. The original title is, Delia vera 

 Injiucjiza degli Ajlr'i nelle Slagioni e Mtitazioni di Tempo, 

 Saggio meteorologtco fondato Jopra lunghe Ohfcrva-^ioni ; 



i^iidMa 



