490 Scientific Proceedings^ Royal Dublin Society. 



chrome, hsematite, and ochres occur in the county Wicklow ; of red 

 haematite of an earthy nature, such as is termed raddle, there is a 

 plentiful supply in the county Antrim. Orpiment and realgar must 

 have been obtained from elsewhere, and the purples were undoubt- 

 edly of artificial origin ; it is probable they were brought from 

 abroad, and^such colours were no doubt treasured as jewels. 



