Vol. 49. Philosophical Magazine. April 18171 



Contents of Number 221 



Paz 



LXIL Remarks on a Paper by Mr. Dao^tok on the CIis. 

 ' mical .Compounds of Azote unci Oxygen, &c. By Wi lt;iatm 

 '. HiGGiNs, Esq. - - - '- . . V ..• 2t1 



LXI 1 1. Answers to .the Gef^ogie.ii Queries -by N. J,- - 

 ^^ Winch, Esq. witii.->omeReniarks, aud further Outriss pro- 

 ^jj.^ posed to tliat Gentlerpun, and to ctlvjr prscrical Invt-sri- 

 UiUors of tlie Strata of the North of England. By "A. Cdii- r 



RESPONDENT. - > -.'.... 



LXIV, On xhii Lehi^th of iiie Seconds PonduiMni,— -on 

 te reciprocal Action of Pendulums,— and ovl The Sv.-iftneiS 



By 



; the recip 



I of Sound in different Substaoces. By M. La placed 

 LXV. On the Piinciples c?£ Beauty in Coloiinnr^. 

 Mr. T. Tredgold. - - - - . *". . 26L' 



LXVI. A furtijer Account of tli? ExhiWcion and Hrtr- 



•;6 



generally received Ru?e of MrJcDlm is 



- 2G9 

 Home's 



273 "t 



tter to .I'vmericH. cy i. j. reTT:G<sK.\v, Jisq. - . z77 >p :# 

 _iXX. On a new Mode of preparing- aisenicatod Hydro- l',^>*i| 



I Gas; with the last -EKperitnu-nts of Gchlen on this C'l!^^) 

 )j^ct. - - - . - - - - - - 280fe^ 



"^aORGAN with Compound Stops. "By.A Correspondunt. • 256 

 IM LXVII. Obseryatiop.f on E'quation cf Payments ; tend- 

 ing tc)_ prove that the 

 |i^ not correct. By Mr. J. B; Bunv/ell, 

 *^^ LXVIII. Answer to Objections aguiast Mr, 

 ^S^ Theory of Vision ' - - • .'■-,.•... 

 iji|| " LXIX. On the Pfiorhtyof tI»eTransn^!>-sionof Covv-pock 

 *" Matter to AmericH. By T. .T. PeTT:G<sK.\v, Esq. 

 LXX. - - - - 



gen^ 



LXXI. On Animalcules, — pni ticul^rly on the Polypes. 

 LXXII. On a Coffee-STiniYieFer. By Dr. Carey. , . 

 LXXIIL Analysis of a vegetable colouring Matter. By 

 M, Vauquelin. - - . ■.. ... 



LXXIV. Answer to i\'ir. -Farley ; with cur.<ory Re- 

 fe^ marks on the Blow-j^ipe and Safety-larnp. ... 



LXXV. Notices respeciiiig New Books . - 

 I.XXVL Proceediiigs of Learned Secieties 

 LXXVIL InteUigencear.d Miscellaneous Articles ;--rEx- 

 ' plosion of ;ui Eiigine-Boilcr — Steam.-Engine;; in Cornwall — 

 Fui thcr Errors in the Nautical Almanac- — Specific Gravity 

 [and Strength of Stones — Ipecacuanha — Experihients wi th the 

 Oxi-hydrogeu Blow-pipe — ^G-as from Oil — Otto Vort Kotzc-. 

 hue's Voyage — Scarlet Dye — New frigorific Powder — ^Hy. 

 I df ophobia — Vegetable PhsEnomen on— Ornithology — Lon- 

 gevity — Comparative Nutritive Substanees-»-Perpetual Mo- 

 Ition — Electrical Phxnomena— Longitude — Safety Lamp — 

 |fl.,ectures — Patents — Astronomy — Meteorology. - vSOOr-SSO 



fei 



^3 



RfOBARD ANB A&tH'VJl^TATtO&) PRIN«CK9^,?UQ£ |^JKV> |.Q!t»Ollr 



