tfthe late P. Nieuwland. 75 



Phyfico-chymiques. The firft part appeared in 1792, and was 

 afterwards re printed in the "Journal de Phyfique. The fecond 

 was published in 1793* and the fourth in 1794. Some let- 

 ters of his on chemiftry may be found alfo in the Iviefienger 

 {Letter bode). 



This ingenious and diligent man was of great fervice alfo 

 in the philofophical department to the above fociety, Felix 

 Meritis, of which he was chofen a titular member on the 

 25th of January 1788, and an honorary member on the 

 15th of March 1 791- The papers forwhichit was indebted 

 to him are as follows : — I. On the newefi difcoveries in ajlro- 

 nomy, and the progrefs lately made in that fcience, 1788. This 

 is an extract from a Latin oration which he intended to have 

 delivered at Utrecht when he expected to fucceed Profeflor 

 Hennert. — 2. On the figure of the earthy 1 789. — 3. On the 

 courfe of comets, and the uncertainty of the return of the 

 comet now expecled, 1790. — 4. On the nature of the mathe- 

 matics. The principal object of this paper was to illus- 

 trate the idea, that the mathematics may be confidered as a 

 beautiful and perfect language. — 5. On the periodical decreafe 

 or increafe in the light of certain fixed jlars, and particularly of 

 the far Algol, 1790. — 6. On the folution of fpherical trigono~ 

 metry by means of a new injlrument invented by Le Guin, 1 791. 

 M. le Guin having tranfmitted to the College of Admiralty 

 at Amfterdam an instrument which might be ufed with great 

 advantage in trigonometrical operations, and by which, in 

 calculating the longitude, one could deduce the real from- 

 the apparent diftance, the Admiralty charged Nieuwland to 

 examine this instrument ; and he found that it might be of 

 excellent fervice for the above purpofe.— 7. On the relative 

 value or importance of the fciencet, 179 1. — 8. On the fyflem of 

 Lavojfier, 1792. — 9. On the Selenotopographia of Schroder^ 

 1793. — 10. On what is commonly called cultivation , i/i/lruc7ion 9 

 or enlightening, 1 793. 



Nieuwland had applied clofely to the mathematics, agro- 

 nomy and navigation for fix years, during which time he 



made 



