12 WORKS PRINTED FOR TAYLOR AND WALTON, 



EDUCATIONA! IVEODEtS continued; 



Apparatus for Magnetism. Price 



18*. in a box. 



A Train of Spur Wheels, 



mounted on a mahogany stand, with 

 weights. Price 2U. in a box. 



A Double Inclined Plane, with 



an Application of the Composition and 

 Resolution of Forces. In a box, 10*. 



A Portable Hydrostatic Bellows; 



with Description and Diagram, including a 

 weight. Price 2U. in a box. 



A Sectional Model of the Steam 



Engine; by which the motions of the 

 several parts, its internal structure, and 

 the high and low pressure principles, can 

 be easily explained. Price 21. 2s. in a box. 



A Pyrometer, for Showing the 



Expansion of Metals. Price ) 5j. 



Diagrams in Wood, to Illus- 

 trate Dr. Lardner's Euclid. Solid Geo- 

 metry, Book I. Price 7*. 6t. 



Geometrical Solids. The Five 



Regular Solids 1. Tetrahedron ; 2. Octa- 

 hedron ; 3 . Icosahedron ; 4. Hexahe- 

 dron; 5. Pentagonal Dodecahedron; 6. 

 Rhomboidal Dodecahedron; 7. Bipyra- 

 midal Dodecahedron ; 8. Trapezohedron. 

 PYRAMIDS. 9. Triangular; 10. Quadri- 

 lateral; 11. Hexagonal; 12. Octagonal. 

 PRISMS. 13. Triangular ; 14. Quadri- 

 lateral; 15. Hexagonal; 16. Octagonal. 

 17. Sphere; 18. Cylinder; 19. Cone. The 

 Set in a box, 9*. 



Another Set, containing the 



Conic Sections. Price 18*. 



A Larger Set. Price II. Us. 6d. 

 An Instrument for Teaching 



Geometry ; convertible into a Theodolite, 

 Spirit Level, Hadley's Sextant, and Wollas- 

 ton's Goniometer. Price 21. 12*. 6d. in 

 a box. 



A Pair of Large Dividers, for 



making Diagrams on a black board. 

 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 1.) 



Also, in Two Parts. 



PART I. INORGANIC CHEMISTRY. 15s. 

 II. ORGANIC CHEMISTRY. 15s. 



" The present is, hi 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 Chemistry which has yet appeared. 

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

 brevity and selectness are combined. The size and price of this little work, as well as 

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



