' CONTENTS. 

 NOVEMBER, 1812. 



Engravings of the following subjects : — 1. The secret and open nectary of 

 various Flowers, delineated from nature, by Mrs. Agnes Ibbetson. 

 2. An apparatus for measuring the soniferous vibration of the gases, by 

 Messrs, Kirby and Merrick. Compensation Pendulum, by R. B. Econo- 

 mical Lamp. Construction of the Keys of Musical Instruments, by 

 John Trotter, Esq. 



I. A Continuation of Experiments on the soniferous Vibrations of the 

 Gases, &c. by Messrs Kerby and Merrick. - - l6l 



II. On the secret and open Nectaries of various Flowers. In a Letter from 

 Mrs. Ibbetson. ------ 171 



III. Chemical Researches on the Blood, and some other animal Fluids. Bjr 

 W.T. Brande, Esq. F. R. S. Communicated to the Society for the im- 

 provement of animal Chemistry, and by them to the Royal Society 179 



IV. Remarkable Effects of the spontaneous Rise and Overflow of heated 

 Soap Lie in a metallic Pump. In a Letter from R. B, with Remarks by 

 W. N. - - - - . . 189 



V. On the Combination of Chlorine with oil of Turpentine. In a Letter, 

 from Mr. R. Porretjun. - - _ - . ig4 



VI. On the Electrical Effects produced by Friction between Bodies, In a 

 Letter from J, A De Luc, Esq. F. R. S. - - - 196 



VII. Meteorological Journal - - - - - 206 



VIII. On the primitive Crystals of Carbonate of Lime, Bitter-Spar, and Iron- 

 Spar. By William Hyde WoUaston. M. D. Sec. R. S. - 208 



IX. Account of an Economical Lamp for producing heat, with a considerable 

 saving of oil. In a Letter from a correspondent, L. O C. - 211 



X. Description of a new Construction and Arrangement of the Keys of 

 Musical Instruments, invented by John Trotter, E^q. (W. N.) 215 



XL A new Compensation Pendulum, without joints or surfaces bearing 

 against, or moving upon each other. In a letter trom a Correspondent. 

 (R. B.) - - - - - - - 217 



XII. Abstract of an Essay on the Construction and Effects of the Pneu- 

 matic Tinderbox, by Le Bouvier Desmortiers. - - 220 



XIII. Analyses of Minerals. By Martin Henry Klaproth, Ph. D. &c. 228 

 Scientific News. — Crystallographic Models, exhibiting the forms of 



( Crystals, their production, geometrical structure, transitions of forms 

 and mechanical dissections. Intended to illustrate she science of Crys- 

 tallography, after the method of Haiiy. Accompanied with a treatise 

 elucidating the elements of that branch of knowledge. By Frederick 

 Accum. M. R. I. A. Operative Chemist and Lecturer on practical Che- 

 mistry, and on Mineralogy and Pharmacy. . - - 23/ 



Notices, &c. to Correspondents, Queries by Inquisitor. - 240 



DECEMBER, 



