1 85 EleBrlcity and Light. — AJironomy. 



fucccfs which attended the firft inoculations encouraged others 

 to liibniit to the fame procefs." 



Dr. Sacco then proceeds to detail three hundred cafes, in 

 which he applied the pus he had obtained in the manner 

 defcribed above, Theie cafes were attended with various 

 circuniftances; but the inoculation fucceeded to produce the 

 cow-pox in all of them ; and in a conliderable number the 

 inoculation for the fmall-pox was afterwards applied, but 

 without any effect,' 



ELECTRICITY AND LIGHT. 



The following hint for eleftric experiments is communi- 

 cated by a perfon who has not a room fitted up properlv for 

 making fuch nice experiments iiinifeif : 



The clcdrk matter being fuppofed by fome philofophers 

 to be the fame as the ether mentioned by Newton, which 

 he imagined conflantly to refide near the furface of all bodies, 

 I wiHi to have the following experiments made by fome of 

 your readers, and the refuhs communicated to the public 

 by your Ma.o;azine. 



Let fmali wire bars he cleftrified fofifwely and negatively^ 

 as it is called, and placed in a convenient fituatioii, fo that 

 rays of light may pafs very near them, and obfcrve whether 

 any difference is produced either in the refleflion or iujleilion 

 of the rays when the bars are electrified; and what that dif- 

 ference, if any, is. Thefc experiments may perhaps give 

 fome infight into the two ftatcs of eleftricity, and iiitorm us 

 whether the pofitive is a condenjcd (late, and the negative a 

 rarejicd ftate, of the ek'6lric matter. 

 March 13, iSoz. 



ASTRONOMY. 



The aflrologers alarmed Europe in 1 186 by announcing 

 a conjunction of all the planets, which was to occadon ex- 

 traordinary ravage. I have fpokcn of this in the preface to my 

 Aftronomy: but, being defirous to know whether this rare and 

 lingular phoenomcnon really took place that year, C. Flau- 

 jguergues, aOociate of the Inllitute, a -zealous alironomer, un- 

 Cj flertook to make the neceflary calculations, and found, indeed, 



that on the 15th of September n86 all the planets were 

 comprehended between 6 ligns, and 6 figns 10 degrees of 

 longitude. This is not exactly a conjunftion, but many 

 thoufands of years perhaps muft elapfe before there will be 

 fuch an approximation towards a conjunOfion. 



De Lalande. 



The ninth planet, difcovcred by Piazzi, afibrds occupation, 



and 



