1868.] MATTHEW — ON PALAEOZOIC ROCKS. 387 



directed attention to the amount of Ozone in the atmosphere, and 

 have been induced to keep daily registers of its amount, so that 

 it would seem that it has an important bearing upon our economic 

 wants. Experience shows that upon days when Ozone was pre- 

 sent in large quantities, the bleaching was better accomplished ; 

 and from experiments carried on in this department, it has been 

 proved that our test papers rather underrate the amount of Ozone 

 absolutely present. The bleaching properties of Ozone have been 

 carried out, still further, for restoring books and prints that have 

 become brown by age and exposure to the light, or have been 

 soiled or smeared with colouring matter — a short time only being 

 required to render them perfectly white, as if just issued from the 

 press, and this without the slightest injury to the blackness of the 

 printer's ink, or the lines of a pen and ink sketch or crayon 

 drawing. 



Writing ink may readily be discharged by Ozone, if the paper 

 be subsequently treated with chlorohydric acid to remove the 

 oxide of iron. Vegetable colouring matters are completely 

 removed by it ; but it does not act so readily on metallic colouring 

 matters or on grease spots. 



Much still remains to be said on this interesting subject. I 

 trust the day is not far distant when it will receive from 

 the scientific world the attention which is due to its great 

 importance as bearing on the health and welfare of the whole 

 community, and that observers will not be wanting to aid in 

 carrying out the important objects embraced in its study. 



ON THE AZOIC AND PALAEOZOIC ROCKS OF 

 SOUTHERN NEW BRUNSWICK. 



By F. G. Matthew.* 



While exploring with my brother, Mr. R. Matthew, the Man- 

 ganese district of King's County, in the summer of 1866, we 

 made some observations on the geology of this County, having an 

 important bearing on the subject of the article above named. 



Huronian. — A more extended examination than had pre- 



* Supplementary note to my paper in the Journal of Geol. Society of 

 London, vol. xxi., p. 422. 



