TABLE OF CONTENTS 



TO THIS ELEVENTH VOLUME. 



V- MAY, 1S05. 



JiiNGRAVlNGS of the following Objects: 1. A very fimpie and perfeaiy 

 fafe Gun-Lock, by Mr. Dodd j 'J. The framing of a Field-Gate with con- 

 fiderable AccefTxon of Strength and great Saving of Material, by Mr. Waiftell ; 

 3. A Compenfation-Curb for a Time-Piece, by Mr. Scott j 4, 5. Plans and 

 Seftions of the Bavarian Salt Works. 



L Letter from Mr. ThomarReid, on the Conftru6lion of Time-keeping 

 ^•> Machines. . _ _ . - Page i 



IL An Analyfis of the Magnetical Pyrites; with Remarks on fome of the 

 other Sulphurets of Iron. By Charles Hatchett, Efq. F. R. S. From the 

 Phil. Tranf. for 1804. - - - •, - 3 



III. Extra»Sl of a Memoir of Mr. Erman, entitled Obfcrvations and Doubts 

 concerning Atmofpheric Eleftricity. - - - 17 



IV. Defcription of a Compenfation Curb. By Mr. James Scott. - 19 



V. Letter from Mr. Bofwell, in Anfwer to an Old Correfpondent. ^l 



VI. Defcription of an improved Gate for Fields. By Mr. C. Waiftell. 23 



VII. Defcription of an improved Gvin-Lock, by Mr. George Dodd. 2S 



VIII. Inveftigation of the Properties of the Lines drawn in a Circle by Mr, 

 Bofwell, in the Tenth Volume of this journal. By Mr. John Gough. 29 



IX. On the Culture, Properties, and comparative Strength of Hemp, and other 

 Vegetable Fibres, the Growth of the Eaft Indies. By Dr. William Rox- 

 burgh, of Calcutta, - - - , - - 32 



X. Defcription of the Bavarian Method of evaporating SaJine Waters. By M. 

 Bonnard, - - - - - - 47 



XL Letter of Inquiry refpefling the late Dr. Irvine's fundamental Expe- 

 riment on the relative Capacities for Heat of Ice and Water. With an 

 Anfwer by Mr. Irvine. - - - - 50 



Xn. Short Account of fome of the moft remarkable Fafts and Obfervations in 

 an Aeroftatic Voyage, made from Peterfburgh, by Meflrs. Robertfon and 

 Sacharoff, under the San6lion of the Impeiial Academy. - - 52 



XIII. Letter from Mr. Cuthbertfon, containing Remarks on Mr. Wm. Wilfon's 

 and Mr. Hauy's Experiments on the Ele6lricity of Metals. - 56 



Scientific News, Account of Books, &c. 57. — Note on the new Planet Juno, ib. 

 — Difcovery of Fluoric Acid *in the Topaz, 58. — Examination of Crude 

 Platina. By Meifrs. Tennant and Wollafton, 59. — Prize Quelhons in France, 

 }h. — Ruffian Circumnavigation, 60. — Geological Journey trom the Academy 

 at Wariaw, ib.' — Lalande's Propofal of a new Scale of the Thermometer, 6\. 

 • — Two Kinds of Honey, ib. — Palladium, ib. — Traiiij elementaire d'Hiitoire 

 Naturclle, &c. An elementary Treatife on Natural Hillory, by A. M. Conllat 

 Dumeril : compofed by Order of Government for the Uie of the Natio^nal 

 Lyceums. 1 Vol. 8vo, Paris. 62. — Elemens de TArt de la Teinture, &c. 

 or Elements of the Art of Dying j with a Defcription of the Procefs of 

 Bleaching by the oxigenated -Muriatic Acid. Second Edition. By C. L. 

 arhd A. B. BerthoUet. Paris. 63. — Confiderations on organized Bodies. By 

 J. C. Delametherle, ib. — Toj^orrefpondents, o4. 



Vol. XL— lb05. a JUNE 



