m 



Vol. VT. is illuftraled with a R.:pr^fentation of a re*flai4taMc 

 E^tlric Piienomcioa obferved in a Thundet-Cloud — Americaa 

 E'ks— -An improved 40 Gallon Slill, which may be cbnrared and 

 emptied upwards of Swenty Times in 2^ Hours— A 1 Lnproved 

 Sfll, wh'ch, eve:i ©n a Urge Scale, mav be charged and run off 

 Foir Hundred and Eighty Times every Twentyrfo.ir Hours — The 

 Urceola EUftica, or Ca<n:t ohovie Vine of Samatra and PjHo? 

 pinan;^ — Mv. Rodmav's newly invented Tr'-pannin^j Inliru ncnt— . 

 lir CoLLiEn's Filtering Machines— The Mas BurlariM^ — A Plite 

 illuftrating certain Phenonie.ia obferved in the Air-Vv.i'.t of the 

 Furnaces of the l>evon Iron- Works — An Air ar^i a Water-Vault 

 for eqiiah'finir the Difchar«re of Air Into a BkH"- Furnace. 



Number XXV. is illuitrated with a Plate illuftrating an unufvial 

 ho!iz>;ntal Refraction of the Air — Apparatus employed by Mr. 

 Howard for trving the E.Teas of fnl minuting Mercury. 



Nu-iiber XXVI. is iUuft-atecJ with a Pijjte to explain the The- 

 ory of the Evening aad Morning Dewr—Vefpertaio Piicatus— Mer- 

 curial Air-holder and Ikeatliing Machine. 



Number XXVII. is illuilrau4 wiiii an improved DiftiUln^ and 

 Reftifving Apparatus for faviag Fuel— Machine by v/bich tlig 

 Strength of Horfes may be employed to knead Pafte for Bread. 



CONTENTS of NUMBER XXVIII. 



Pag6 



I. On the EleAricity excited by the mere Contv.ft of Con- 

 duftinp- Subdances of difTcrent Kinds, In a Letter from Mr. 

 Ai.ETCANDBR VoxTA, F.R.S. Profcffor of Natufal Philofopliy 

 In the Univerfity of Pavia, to the Right Hon. Sir Joseph 

 Bank?, Bart. K.B. P.R.8. - - - 290 



II. Inveftigation of the Pow«rsof the prjftrr>tic Colcurs.to 

 He;it and Klunanate Obi-'a*; ; with Pvemarks thnt prove the 

 difTerent RefraTiglbiiity of Radiant Heat : to wh-'ch is added, 

 ^n Inquii7 into the I^'ethod at viewing tlic Sr.n advant^eoufly 

 ;«'ith Telefcopes of" Ip.rge Apertures and liigh magnifying 

 I^owers. By WiLxiAM Herschel, LL.D. F.R.S. -_ ju 



III. Account of a Scries of Experiments u^der^aken with 

 the View of decompofing the Muriatic Acid. By Mr. Wil- 



iiAM Henry . " - - - , T •«, n-" xr ^^' 



- iV. Exp^nmeats in Gnlvanio Ekftricity, by Meflrs. Ni- 

 CHOi/goK, tABi.lSLE, Cuuickehank., &C. - - 337 



V. Letter from Hf,nr.y Movfs, M. D. to Maxwell 

 0ARTHSJBORE, M. D. contaiulug an Account of fome inte- 

 relUng Experiment: in Galvanic ElrCtricity. Comtnunicale.d 



by Dr. Gartiisiio E - - '^ ^ ' „ , ^'*'- 



VI. A Projeft for cxtetsdine- t^.e Breed 01 hne-yroollcd 

 Spaniih Sheep, now in the Poffalion of Plis Majcfty, into all 

 Parts of -Great Britain, where the" Gromh of fine Clothing 

 V/ocls ig found to be prolUftUc til 35"^- 



