28 Whittaker and Co.'s List of J!9ractical a^ercantile Corresponricnce. A Collection of Commercial Letters and Forms, with Notes, Explanatory and Grammatical, and a Vocabulary of Commercial Terms, edited by L. Simon, Chr. Vogel, Ph.D., H. P. Skelton, W. C. Wrankmore, Leland Mason, and others. Intended as Class Books for Schools and for Self-Instruction. Now Ready, crown Szio, cloth : ENGLISH, with German Notes, y. GERMAN, with English Notes, zs. ENGLISH, with French Notes, 4^. dd. FRENCH, with English Notes, 4J. (>d. This new Collection of Model Letters and Epistolary Forms embraces the whole sphere of Commercial Transactions. Each example is provided with such remarks and explanations, that any one with a fair giammatical knowledge of the particular language will find it an easy matter to prepare a well-expressed letter. Cije ^peciaU0t's Series. A New Series of Handbooks for Students and Practical Engineers. Crown Svo. With many Illustrations. GAS ENGINES. Their Theory and Management. By William Macgregor. With 7 Plates. Crown Svo. pp. 245, &s. 6d. BALLOONING: A Concise Sketch of its History and Principles. From the best sources. Continental and English. By G. May. With Illustrations. Crown Svo. pp. vi.-g/, 2s. 6d. ELECTRIC TRANSMISSION OF ENERGY, and its Transformation, Subdivision, and Distribution. A Practical Handbook by Gisbert Kapp, C.E., Associate Member of the Institution of Civil Engineers, &c. With 1 19 Illustra- tions. Crown Svo. pp. xi.-33i. 7^. 6d. ARC AND GLOW LAMPS. A Practical Hand- book on Electric Lighting. By Julius Maier, Ph.D., Assoc. Soc. Tel. Eng., &c. With 7S Illustrations. Crown Svo. pp. viii.-376. "js. 6d.
