HORIZONTAL MOON. 237 



nearer to his lens when the h'ght was rendered fainter by h« 

 card; if he miftook the greater vifibility oi' the fmaller image 

 for a proof that it was in the focus of the lens; in a word, iif 

 he did not paufe and examine former fads before he adopted a 

 conclufion fo repugnant to many of them, I would fubmit to 

 yourfelf and readers whether he has aded confiftently with the 

 rules of philofophical inveftigation, or has any reafon to prize 

 his own foiution beyond that which is founded on the rules of 

 linear perfpeclive*. 



I am. Sir, 



Your humble fervant, 



C. L. 



V. 



Tfie Method of preparing Chinefc Sni^, By Michael de 



GuUBBENS.f 



In the ads of the Swedifli Academy, for 1764., page 38, Ekeberg*s ac- 

 we find a defcription of the preparation of Chinefe S(y, b. enoneous."^^ 

 the late Captain Ekeberg ; but as this defcription is not only 

 incomplete but even deficient in accuracy, fo as not to produce 

 the true Chinefe compound, I am well convinced that Mr. 

 Ekeberg muft have been unacquainted with the a6lual procefs. 

 It is moft likely that he depended upon information given him 

 by the Chinefe who are not always to be trufted; a fa6l of 

 which I have had fufficlent reafons to be convinced, during 



* Mr. W. having foppofed that the want of land obje6ls muft 

 take away the notion of diftance at fea, reminds me of an incident 

 concerning the Panorama of Black-Friar's Bridge. Thispiflure 

 was exhibited with indications of a confiderable wind with waves 

 on the river, at the fame time that the buildings on the London fide 

 were feen reflected in the water. I took notice cf this inconfiftency, 

 and the ingenious author replied that the water had been atfiift 

 painted as if fmooth ; but it was found neceffary to put in the waves 

 in order to give diftance by their regular diminution in perfpeflive, 

 and that the rcfleilions were kept In from a notion that they would 

 rather add to the eifeft than offend by their want of perfeiSl truth. 



f Extraftcd from the Memoirs of the Academy of Sciences of 

 Stockholm for 1803, by M. Linborn, and inferted in the Annales "* '* 



-de Chimie, Vol. L, from which the prefent tranflation is made. 



my 



