CORRECTIONS AND ADDITIONS TO VOLUME II. 



Page 76, in the note, for killed read skilled. 



126, 1. 23, for " notion of pearls" read " origin of pearls." 

 282, for *' Ap;)^»jiAii7u?" read " Ap^tjM.iiJ'g?." 



356, in the note, for " calculus concretion" read " calculous concretion.'* 

 In the running title from p. 203 to p. 231 , for vol. ix. read vol. x. 

 To the note on alum, p. 458, add: Kelp ashes are an impure saline pro- 

 duct. Besides other saline matters, they contain both soda (mineral al- 

 kali) and potash (vegetable alkali). It would appear that it is the last- 

 mentioned alkali which renders the kelp-ashes useful in the preparation of 

 alum. — ^When, together with the incinerated ashes of vegetables, putrid 

 urine is also employed, the obtained alum is a quadruple salt. There is 

 much room for improvement in the fabrication of this compound salt, so 

 useful in the processes of dying and other arts. 



