This Day are published in 8vo. with four Copper-plates^ and 1 1 1 Wood- 

 cuts, Trice i5s. Boards, 



ELEMENTS of CRYSTALLOGRAPHY, after the Method of 

 HAUY i with, or without. Series of Geometrical Models, both solid 

 and dissected ; exhibiting thu Forms of Crystals, their geometrical Struc- 

 ture, Dissections and general Laws, accoiding to which the i.vimcnse Va- 

 riety of actually existing Crystals are produced. 



By FREDRICK ACCUM, Operative Chemist, 



Printed for Longman, Hurst, Rees, Ormc, and Brown, Paternoster Row. 



This Day is published, in Svo. containing twelve Plates, Price iSs, Boards. 



A TREATISE ON NEW PHILOSOPHICAL INSTRUMENTS, 

 for various Purpo.es in the Arts and Sciences. With Experiments 

 on Light and Colours. 



By DAVID BREWSTER, LL.D. 



Fellow of the Royal Society of Edinburgh, and of the Society of the 

 Antiquaries of Scotland. 



printed for John Murray, Albemaile-street (late Mr. Miller's) ; and 

 W. Blackwood, Edinburgh. 



ENGRAVINGS. 



Vol. XXXIV. Two Plates to Illustrate M. Hauy's Crystallography — 

 Apparatus to illustrate Mr. Davy's Bakerian Lecture. — A Qrarto and an 

 Octavo Plate descriptive of Mr. Troughtos's new Dividing Instrument. — '■ 

 A Plate to illustrate Mr. Vaklcy's Paper on Thunder Storms. — Another 

 Plate to illustrate H/vuy's Theory of' Crystallization. — A Quarto Plate to 

 illustrate Mr. Kiv.w.vn's new Anemohieier3 engraved by Poktek. — An 

 Octavo Plate to illustrateM. Hauy's Crystallography; engraved by Lowky. 

 —A Pl?te to illustrate Mefsrs. Alliin and Pepvs's new Experiments on 

 Respiration, E^igravcd by Pcrtkk. — A Plate to illustrate M. Hal'y's 

 Crybta lography. — A Plate illustrating the Construction of Mr. CleGg's 

 Rotative 6t<rrini Engine. — Another Plate on the same Subject. — A Plate of 

 Crystals to illustrate M. Kai/v's System. 



Vol. XXXV, A Head of M. Hauy, engraved by T. Woolnoth from 

 an original Drawing by F. Massard. — A Plate illustrating M. Hauy's 

 Crystallography. — Dr. Wollastoh's Goniometer: Dr. Healy!s New 

 Cupping Inslrume'it : and a Diagram to illustrate Mr. Walrer's Theory 

 of Vision. — A Plate to illustrate Hauy's Crystallography.— Mr. Caven- 

 dish's dividing Instrument. — New Electrical Apparatus, — A Plate to illus- 

 trate iVI. Hauy's System ofCr3'stallography. — Mr. Accum's Hydro-pneu- 

 matic Table.— =-A Plate to illustrate M. Hauy's Ciystallography. — Captain 

 Pasley's Telegraph, and Mr. Johns's Apparatus for Decomposing Potash 

 and Soda. — Diagrams to illustrate M. Mon«;e'h Paper on theCompositiori 

 and DtcomjJOiilion of Forces. — A Plate to illustrate Hauy's Crystallo- 

 graphy. — Two Plates of Apparatus employed by Mr. Davy in the Electro- 

 ebcmical Experiments detailed in his Bakerlan Lecture. 



