172 On a new Photo -Lithographic Process. 



the surrounding matter, resisted the decomposition which 

 has attacked the latter ; and now they stand out like roots 

 or trees. Mr. Darwin found many land shells round them, 

 which quite bears out his view of their sub-seriel origin. But 

 at Cape Grant nothing of the kind is visible. The so-called 

 roots may often be traced many feet through different strata, 

 and are quite as thick at the bottom as at the top. Besides, 

 there is evident proof that there has been nothing but up- 

 heaval since the trap was deposited; and as a great part of 

 the crag, even now, lies beneath the sea, there has been no 

 opportunity for trees to grow where the supposed roots are 

 found. I believe such formations as the crag are common on 

 the whole coast westward as far as Western Australia ; and it 

 is just what we might expect to follow the extension of a great 

 coral deposit before the site of the coral reef was raised into 

 dry land. 



I have now described the tertiary rocks at Portland Bay. 

 My object has been only to draw attention to the rocks that 

 are there visible, in order that future investigators may have 

 a clear idea of their sequence and nature, in any examination 

 they may make of the locality. 



Art. XVII. — On a new Photo-Lithographic Process. By 

 John Walter Osborne, Esq. 



(With an illustrative Map.) 

 [Bead before the Institute 30th November, 1859.] 



Photographic science has of late years .made such asto- 

 nishing progress, that it has stimulated the inventive 

 genius of scientific men, awakening in them the very 

 natural wish to make its many advantages applicable to the 

 several graphic arts. The result has been the more or less 

 perfect development of a number of processes bearing directly 

 upon the reproduction of works of art. 



Thus the application of photography to engravings has 

 been the object of Mr. Fox Talbot's exertions ; Niepce de 

 St. Victor and Mr. Pretsch are also working in the same 

 direction; while several gentlemen, of whom I shall subse- 



