TO CORRESPONDENTS. 



The following communications have been received : 



From Mr. M. Smith, On the PlanetSaturn:— From Mr.I.NEWTON, A Theorem : 

 —From Professor Hare of Philadelphia, Strictures on Mr.VANuxEM's Memoir 

 on Anthracite, &c.; and a Description of some improved Eudiometers. 



Errata.— In page ;311, line 27, supply " and tables" after instruments, page 

 212, line 4, for cos. D read coi. J. 



PHARMACOPCEIA LONDINENSIS, 



Iterum recognita et retractata, 1824', p. 6. 

 '^ACIDUM ACETICUM FORTIUS" 

 vel 

 " Acidum Aceticum e Ligno destillatum." 



PURE CONCENTRATED ACETIC ACID, agreeable to the Sample 

 furnished at the request of the Committee of the Royal College of 

 Physicians, may be had of the Manufacturers, BEAUFOY & CO. South 

 Lambeth, London. 



ENGRAVINGS. 



Vol.LIV. A Plate illustrative of the Menai Bridge. — ^A Plate illus- 

 trative of Mr. Lowe's Description of a Mercurial Pendulum. — A Plate 

 illustrative of Mr. Hare's Calorimotor, a new Galvanic Instrument— A 

 Plate illustrative of Captain Sabine's Paper on Irregularities observed in 

 the Direction of the Compass Needles of the Isabella and Alexander in 

 the late Voyage of Discovery ; and Mr. Scores b's Anomaly in the Va- 

 riation of the Magnetic Needle as observed on Ship-board. 



Vol. LV. A Plate exhibiting a Sketch of the Comet's Path of July 181.9. 

 —A Plate illustrative of the Annular Eclipse of the Sun on the 7th of 

 September next. — A Plate illustrative of Mr. Lane's Instrument for 

 gathering Fruit; Mr. Young's Mode of preparing Opium from tJic 

 Papaver somniferum; and of Captain Forman's Essay on a Property in 

 Light which hitherto has been unobserved by Philosophers. — A Plate de- 

 scriptive of Mr. CuTH Bert's improved Hydro-pneumatic Apparatus, &c. 

 — A Plate illustrative of Capt. Forman's Ess.iyon the Reflection, Refrac- 

 tion, and Inflection of Light, &c. ; and Mr. Charles Bonnycastle's 

 Communicacion respecting the Influence of Masses of Iron on the Mari. 

 ner's Compass. 



Vol. LVI. A Plate illustrative of Mrs. Ibbetson's Paper On the Phy- 

 Mology of Botany. — A Plate illustrative of Mr. Hall's Percussion Guii- 

 Lock; of Dr. Kitchiner's Pancratic Eye-Tube; and of Mr. Park's 

 Mooring Blocks. — A Plate exhibiting Sections, &c. of Mr. Malam's im- 

 proved Gas-Meter. — A Plate exhibiting the Discoveries made by Capt. 

 Parry in the Polar Sea. 



Vol. LVII. A Plate illustrative of Mess. OErsted and Ampere's 

 Electro-magnetic Experiments, and Mr. Perkins's Paper on the Com- 

 pressibility of Water. — A Plate illustrative of Mr. Jamieson's Marine 

 Thermometer Case, and Mr. Jenning's Mercurial Log-Glass.— -A Plate 

 illustrative of Dr. Hare's new Modification of Galvanic Apparatus. — A 

 Plate representing a Double Canal Lock, originally proposed for the Re- 

 gent's Canal, by xMr. R. H. Gower; and a Modification of Electro-niag- 

 retic Apparatus, by Mr. Taicm. 



