12 WORKS PRINTED FOR TAYLOR AND WALTON, 



EDUCATIONAL MODELS continued. 



Apparatus for Magnetism. Price 



18*. in a box. 



Geometrical Solids. The Five 



Regular Solids 1. Tetrahedron ; 2. Octa- 



Am f c) -\-KTI i hedron ; 3 . Icosahedron ; 4. Hexahe- 



iram OI kpur Wheels, j dron; 5. Pentagonal Dodecahedron; 6. 



mounted on a mahogany stand, with ; Rhomboidal Dodecahedron; 7. Bipyra- 



weights. Price 21s. in a box. midal Dodecahedron ; 8. Trapezohedron. 



A TV -ui T v J TI PYRAMIDS. 9. Triangular; 10. Quadri- 



A JJOUDle inclined. Jrlane, With j lateral; 11. Hexagonal; 12. Octagonal. 



an Application of the Composition and I PRISMS. 13. Triangular; 14. Quadri- 



Resolution of Forces. In a box, 10* lateral; 15. Hexagonal; 16. Octagonal. 



A -n i. i_i TT J j.' -r, n 17. Sphere; 18. Cylinder; 19. Cone. The 



A Portable Hydrostatic Bellows; set ma box, 9*. 



with Description and Diagram, including a ! A^nf^p., Q p f PrmtmYnno- fhf> 



weight. Price 2is. in a box. Anotner bet, containing tne 



/-M -i - *- n Conic Sections. Price Ws. 



A Sectional Model of the Steam AT o^-n- 1711 aj 



Engine; by which the motions of the A larger Set. PriCC II. Us. Qd. 



several parts, its internal structure, and I A TTisfvnTYiPnf fnr TAnpTiino- 



the high and low pressure principles, can ^ U 



be easily explained. Price 21. 2s. in a ^box Geometry; convertible into a Theodolite, 



Spirit Level, Hadley's Sextant, andWollas- 



A Pyrometer, for Showing the ton's Goniometer. Price 21. 12s. 6d. in 



Expansion of Metals. Price 15s. a box. 



Diagrams in Wood, to Illus- ! A Pair of Large Dividers, for 



trate Dr. Lardner's Euclid. Solid Geo- ! making Diagrams on a black board, 



metry, Book I. Price 7*. 6d. Price 4*. 



MINASFS MECHANICAL DIAGRAMS. 



For the Use of Lecturers, and Schools. Complete in Five Numbers, each containing Three 

 Sheets of Diagrams, price 3*. each Number, coloured, illustrating the following subjects : 

 1 & 2. Composition of Forces 3. Equilibrium. 4 & 5. Levers. 6. Steelyard, Brady Ba- 

 lance, and Danish Balance 7. Wheel and Axle. 8. Inclined plane 9, 10, 11, Pulleys. 

 12. Hunter's Screw. 13 & 14. Toothed Wheels. 15. Combination of the Mechanical Powers. 



The Diagrams are printed on large sheets of paper, measuring 2 feet 11 inches by 2 feet. 

 This size will be found suited for large lecture rooms. 



CHEMISTRY. 



TURNER'S ELEMENTS OF CHEMISTRY. Eighth Edition. 



Edited by JUSTUS LIEBIG, M.D., Professor of Chemistry in the University of 

 Giessen, and WILLIAM GREGORY, M.D., Professor of Chemistry in the University 

 of Edinburgh. 1 vol. 8vo. II. 10s. (See page ].) 



Also, in Two Parts. 



PART I. INORGANIC CHEMISTRY. 15*. 

 II. ORGANIC CHEMISTRY. 15s. 



" The present is, in short, the most complete and the most luminous system of 

 Chemistry in the English language; and we know no one in France or Germany that 

 comes near it." Edinburgh Medical and Surgical Journal, Jan. 1, 1847. 



GREGORY'S OUTLINES OF CHEMISTRY, for the use of 



Students. By WILLIAM GREGORY, M.D., Professor of Chemistry in the Uni- 

 versity of Edinburgh. Second Edition, revised and enlarged. Complete in 

 1 vol. foolscap 8vo, 12s. cloth. Part I. (INORGANIC CHEMISTRY), 5s. cloth. 

 Part II. (ORGANIC CHEMISTRY), 7s. cloth. 



' This is beyond comparison the best introduction to ChemiRtr y which has yet appeared. 

 The directions for preparing substances are usually confined to the best method, so that 

 brevity and selectness are combined. The si/e and price of this little work, as well as 

 its intrinsic merits, commend it to every student of Chemistry." Lancet. 



