in the West Indies. 477 



and this morning. About sun-set, on Thursday evening, we 

 observed an immense quantity of fire and smoke to proceed 

 From the volcano, and continued till one o'clock this morn- 

 ing, when a most tremendous explosion took place, and 

 contiiuied till four, throwing up immense quantities of 

 stones and ashes all over the island. On the estates in the 

 vicinity of the mountains the ashes are said to be from two 

 to three feet deep ; that two of the principal riverS have 

 been dried up, and new ones formed ; and that many of the 

 estates in that quartfr have been much injured. One white 

 person and six negroes have been killed. Although Kings- 

 ton is at the distance of about twelve miles from the 

 volcano, the inhabitants were so much alarmed, that many 

 of them went on board of the vessels in the bay for pro- 

 tection, and it was not until past 8 o'clock that one person 

 could distinguish another, in consequence of the atmo- 

 sphere being darkened by the quantity of ashes. I am 

 much afraid that the extent of the damage sustained \% not 

 yet known." 



A second Communication from Mr. William Moore, on 



the Use of Oxymnriate of Magnaia in Bleacking. 



To Mr. TiUoch. 



Sir, — Since my former communication to you, I have 

 received a letter from my brother (Mr. J. W. Moore, of 

 Dublin), inclosing a copy of a letter he received from Mr. 

 John Dnpny junior, relative to the use of oxymnriate of 

 magnesia by that enlightened gentleman in his manufactory 

 near Dublin. ' 



I will thank you to add it (if possible) as an appendix to 

 my former paper on this sul)ject*: it is as follows: "I 

 have used the oxymuriate of magnesia on the large scale, 

 ever since December 1810, and smce then have been daily 

 extending the application of it. To the communication 

 I made Mr. Davy on this subject, I do not feel I could add 

 any thing further, unless in generally stating my since ex- 

 perience, as confirming its superiorilv over the oxymnriate 

 of lime for whitening the grounds oi ddicate dyes, such as 

 yellows, madder reds, &c." 



The inaccuracy of Dr. Ogill)y'3 statemfnts are still 

 further confirmed by this second letter of Mr. Duppy's; 

 and ahhouiih I did not entertain a doubt as to their fate in 

 the scientific world yet they miuht deter the manufacturer, 

 from adopting these improvements. Under ihes-e impres- 

 tions I have been induced to trespass on your intlulgence, 

 I remain with respect. Your much obliged, 



London, -J.^th J uJie, 1812. \V M . MOORR. 



• Ttiis communication reached us too late for inscriion in the form 

 wished by the author. 



