472 v AW Scientific Books. [Dec. 



IX. Compact Felspar. 



A specimen of supposed compact felspar, from Siebenlehn, ana- 

 lyzed by Klaproth, was composed of 



Silica 51-0 



Alumina 30-5 



Lime 11-25 



Soda 4-00 



Oxide of iron 1 "75 



Water 1*25 



Loss -25 



100-00 



X. Topaz. 

 Great numbers of topazes have been lately brought to this 

 country from Botany Bay. Mr. Mawe showed me parcels of them, 

 which had exactly the characters of the topaz of Scotland. As this 

 last is much scarcer and dearer than the Botany Bay topaz, there is 

 reason to fear that the latter may be substituted for the former. 



Article XIII. 



Scientific Books in hand, or in the Press. 



Mr. Thomas Forster will publish in a few days an edition of the 

 Diosemea of Aratus, with the Scholia, Notes, and a collation of parallel 

 passages, so as to comprehend the whole of the Ancient Doctrine of 

 Prognostics. The greatest part of the Meteorological Excursor, which 

 were to have followed at the end, having been consumed by fire, the 

 author can only insert a fragment of them, being the labour of two 

 years. 



Mr. Bakewell is preparing for the Press a Second Edition of his 

 Introduction to Geology, which will be considerably enlarged, parti- 

 cularly by information acquired during the author's recent examination 

 of different parts of England, and the Eastern Coast of Ireland. This 

 edition will contain a notice of the most important geological discove- 

 ries and observations which have been made on the Continent of 

 Europe, and in various parts of the globe, since the publication of the 

 former, and is intended to comprise a view of the progress and present 

 state of the science. 



A New Edition, considerably enlarged and improved, of Dr. Lett- 

 som's Naturalist's and Traveller's Companion, will be published next 

 month. 



Lieut. Gen. G. Cockburn's Narrative of his Voyage up the Mediter- 

 ranean in 1810 and 1811 will be shortly published. It contains an 

 account of a tour in Sicily, Malta, and the Lipari Islands. 



