two gafcs. 



<2|84 ON THE HORIZONTAL MOON. 



llien no tranfmiflion is obiervable in either; bat if (he retort 

 have comraon air, or any other gas, without, and aqueous 

 vapour, or any other elaftic fluid, except the ontfide one, 

 within; then the motion in and out commences, juft as with 

 the phials in (imilar circumftances. In fa£l this laft obfervation 

 has fince been verified by Dr. Prieftley himfelf, of which an 

 account is given in No. 2, of the American Philofophical 

 Tranfafllons, vol. 5. After alluding to his experiments above- 

 — and the fame mentioned, he obferves, *' Since that time I have extended 

 happenj in any and diverfified the experiments, and have obferved, that what 

 was done by air and xvater, will be done by any two kinds of 

 air, and whether they have affinity to one another or not, tl-iat 

 (his takes place in circumftances of which I was not af all ap- 

 prized before, and fuch as experimenters ought to be ac- 

 quainted with, in order to prevent niiftakes of confiderable 

 confequence/' 



The fafls ftated above, taken altogether, appear to me to 

 form as decifive evidence for that of elaftic fluids which T 

 maintain, and againfi the one commonly received, as any phy- 

 fical principle which has ever been deemed a fubje6l of dif* 

 pute, can adduce. 



III. 



On the Horizontal Moon. By Dr. Ok el v. In a Letter from 

 Mr. H. Steinhauer. 



To Mr. NICHOLSON. 

 SIR, Fulnuk, March 1, 180(J. 



-tl-BOUT the beginning of laft year, I had the pleafure, in 

 compliance with your obliging letter to fend you impreffions 

 of the Egyptian Scarabacus, which I hope camefafe to hand. 

 Your kindnefsin inferting my trivial remarks upon the fame in 

 •\our valuable Journal, encourage me to fubmit the following 

 lliort efl'ay, upon a fubjeft which has employed the ingenuity 

 of feveral of your correfpondents, which I received from my 

 friend Dr. Okely, of Wyke, near Hallifax, in confeqiience of 

 fome converfaticns occafioned by the perulal of your work. 



If 



