Information is respectfully desired relating to the late JAMES SMITHSON, 

 F.R.S. (who died in 1829). 



The SMITHSONIAN INSTITUTION, UNITED STATES, of which MR. 

 SMITHSON was the Founder, is desirous of obtaining information respecting 

 that gentlemen, to assist in the preparation of a Memoir. Any Original Letters 

 or Personal Reminiscences will be received thankfully. A printed list of the 

 questions on which information is desired will be supplied on application to 

 William Wesley, 28 Essex Street, Strand, London, Agent of the Smithsonian 

 Institution. 



NEW AND ENLARGED EDITION. 



Now ready, in crown 8vo. with Frontispiece, price 12s. 



HEAT A MODE OF MOTION. 



By JOHN TYNDALL, F.R.S., D.C.L., LL.D., 



Professor of Natural Philosophy in the Royal Institution of Great Britain. 

 Sixth Edition (Thirteenth Thousand), thoroughly revised and augmented. 



London : Longmans and Co. 



Royal 4to, cloth boards, price £1. 

 FACTOR TABLE FOR THE FOURTH MILLION, 



CONTAINING THE 



LEAST FACTOR OF EVERY NUMBER NOT DIVISIBE BY 2, 3, or 5 



BETWEEN 



3,000,000 and 4,000,000. 



By JAMES GLAISHER, F.R.S. 



Taylor and Francis, Red Lion Court, Fleet Street, E.C. 



Now ready, 

 Volume II., containing 708 pages, illustrated by 267 Woodcuts (drawn to scale), 

 A THEORETICAL AND PRACTICAL TREATISE ON THE MANU- 

 FACTURE OF SULPHURIC ACID AND ALKALI, WITH THE 

 COLLATERAL BRANCHES. 



By GEORGE LUNGE, Ph.D., F.C.S., 



Professor of Technical Chemistry at the Federal Polytechnic School, Zurich, 



formerly Manager of the Tyne Alkali-works, South Shields. 



This volume contains the entire series of operations of an Alkali-works 



in which the Leblanc process is employed, beginning with the Manufacture of 



Soda and ending with the Utilization of Soda-waste. 



By the same Author, very recently published, 



Volume I., containing 



THE MANUFACTURE OF SULPHURIC ACID: 



658 pages of Text and illustrated by 809 Woodcuts, price £1 16s. Od. 

 John Van Voorst, 1 Paternoster Row. 



[ADVERTISEMENTS continued on 3rd page of Cover. 



