TO CORRESPONDENTS. 



XX on a Method of observing a Solar Eclipse has been received.— ^Ye shall 

 be glad to hear from him relative to the other subject which he mentions. 

 The following Communications have also come to hand : 

 On Saturn's Ring: and on an Analogy in the Planetary System, by Mr.UTTiNc. 



On the Temperature of Mines ; and on Chlorate of Potassa and Chlorine in 

 Therapeutics ; by Mr. J. Murray. 



On Short-hand Writing ; by Mr. Upington. 



We have to request the indulgence of some of our Correspondents for whose 

 Communications we have net yet been able to find room. 



Dr. JONES'S GREEK AND ENGLISH LEXICON. 



On Friday the ithof July will be published, by Messrs. Longman and Co. 

 Paternoster-row, in one large volume octavo, price 30s. in boards, 



A GREEK and ENGLISH LEXICON. By JOHN JONES, LL.D. 

 Author of the Greek Grammar. 

 In this work are contained all the words used by the best Greek writers 

 of prose and verse. The secondary senses of a term are derived from the 

 primary, and the primary when doubtful deduced from one of the orien- 

 tal tongues— each word, and in general its distinct senses are justified by 

 reference to the original authors. The doubtful vowel in the explained 

 word is marked as long or short. Intended not only for the use of learners 

 in private and the public schools, but also for those who after the usual 

 l)eriod of education seek a fuller and more extensive acquaintance with 

 the language and literature of Ancient Greece. 



A 



-^ This day is published, 



The Third Edition, enlarged, and Illustrated by 4^00 Wood Cuts, 



In one volume, Svo. price IGs. boards, 

 N ELEMENTARY INTRODUCTION TO THE KNOW- 

 LEDGE OF MINERALOGY : 

 Comprising some Account of the Characters and Elements of Minerals ; 

 Explanation of Terms in common use ; Descriptions of Minerals, with 

 Accounts of the Places and Circumstances in which they are found; 

 and especially the Localities of British Minerals. 



By WILLIAM PHILLIPS, F.L.S. M.G.S. L. and C. 

 Honorary Member of the Cambridge and Yorkshire Philosophical 

 Societies. 

 London: Printed and sold by W. Phillips, George Yard, Lombard- 

 Street. Sold also by W. and C. Tait, Edinburgh'; and R. Milliken, 

 Dublin. ' s . 



Just published, in one volume, price 16*. boards, 



A FAMILIAR INTRODUCTION to CRYSTALLOGRAPHY, 

 mcludmg an Explanation of the Principle and Use of the Gonio- 

 meter. Wkh an Appendix, containing the Mathematical Relations of 

 Crystals ; Rules for drawing their Figures; and an Alphabetical Arrange- 

 ment of Mmerals, their Synonyms, and Primary Forms. Illustrated by 

 nearly 400 Engravings on Wood. 



By HENRY JAMES BROOKE, F.R S. F.L.S. &c. 

 London : Printed and published by William Phillips, George Yard, Lom- 

 bard Street. Sold also by T. and G. Underwood, and by S. Highley, 

 Fleet Street ; and W. and T. Tait, Edinburgh. 



