Scientific Intelligofice, — Arts'. 411 



and that what he obtains by this i)rocess is finer and more bril- 

 hant than the natural colour. It was by following the analysis 

 made by M. Clement Desormes that the inventor accomplished 

 this desirable object. M. Tunel has already been able to sup- 

 ply the public with ultramarine at 25 francs the ounce ; the co- 

 lour having hitherto been sold for 50 or 60 francs the ounce. 

 He hopes that he shall be able to sell it at a still more moderate 

 price. M. Tunel Jias thought proper to keep this process secret 

 for a certain time. — Lc Globe, Fev. 9. 1828. 



27. St Helena Silk. — A specimen of the raw silk, produced 

 at the island of St Helena, has arrived in England. It is the 

 first perfect one, and is considered to be of a very fine quality. 

 It is entirely free from any disagreeable odour, which speaks 

 much in its favour. In last August the number of worms in 

 progress was 218,000, which were in a very healthy condition, 

 and expected to spin in the course of a few days. The mul- 

 berry trees thrive remarkably well, and have a very luxuriant 

 appearance. 



28. Size and Value of Mahogany.— ^^^ Three boats were each 

 cut out of a single tree, one mahogany, the other cedar, measur- 

 ing about thirty-five feet in length, nearly six feet in breadth, 

 and above five feet in depth. Few people are acquainted with 

 the immense size and value of some logs of mahogany brought 

 to this country. The following may serve as an example : " The 

 largest and finest log of mahogany ever imported into this coun- 

 try has been recently sold by auction at the docks in Liverpool. 

 It was purchased by James Hodgson, Esq. for L. 378, and af- 

 terwards sold by him for L. 525, and, if it open well, it is sup- 

 posed to be worth L. 1000. If sawn into veneers, it is computed 

 that the cost of labour in the process will be L. 750. The 

 weight on the King''s beam is six tons thirteen hundred weight." 

 — Roberts' Voyages to the East Coast of Central America w 

 ConstabWs Miscellany. 



NEW PUBLICATIONS. 



29. Illustrations of Zoology ; by J. Wilson, Esq. F.R.S.E. 

 M. W. S. — The third Number of this beautiful and classical 

 work has made its appearance ; but want of room forces us to 



