Economical Society of Leipsic at Dresden, &c. 183 



the bankino--pin. But when i\vt bankhig-piu P has arrived 

 at O the bankino-picce s will have advanced to t, by the 

 pei^ulum spring'winding Itself up into the figure repre- 

 sented by the dotted curve ; and when the banknig-pui i 

 (now at b) returns back to P, and passes on h-om P towards 

 O, to am^oach B, and so complete the other half- arch of 

 its vibration, before P can arrive at the banking-cock B, 

 the pendulan) spring will have unwound itselt into the 

 fijrure described bv the dotted curve, and the banking-piece ^■ 

 wTll have advanced into the position at r, just touching the 

 bankincr-cock. Its extremity r, however, being thrown 

 beyond°the dotted circle, must necessarily fall m the way 

 of the banking-pin, which arrives there al uost at the same 

 moment, and is opposed by it, without the slightest shock 

 to the pendulum spring. The model renders any further 



explanation unnecessary. 

 ^ W1H.1AM Hardy. 



XXXII. Proceedings of Learned Societies. 



ECONOMICAL SOCIETY OF LEIPSIC AT DRESDEN. 



On a request by Count von Reisch, this society has pro- 

 posed the two following prize questions : 



1st, To determine the means, established by experiment, 

 of extirpatimi from fields of oats and barley the wild radish 

 iRaplianus Raphnnistrum), with instances of these means 

 provinf^ successful. The prize is h Fredericks of gold. 



2d, To invent a handmill of a simple construction, easy 

 to be moved, and which will not cost more than forty 

 rix-doUars. The inventor must send a model and scale. 

 The prize is 8 Fredericks of gold. The papers, written in 

 the German lat^uage, must be transmuted with a sealed 

 device to tiie secretary of tlie society at Dresden, bctore the 

 end of April 1805. 



XXXIII. Intelligence and Miscellaneous Articles, 



ORIGINAL VACCINE POCK INSTITUTION, 



No. 44, Broad-Street, Golden- square. 

 Quarterly Court, 

 The foUowincr Resolutions, on the authority of a public 

 institution, miTst serve to tranquillize many families dis- 

 turbed by prevailim: ill-founded report^ ; and the niHice ot 

 " M- 4 "'« 



