t6l xlv.] philosophical transactions 5gg 



sometimes recent, and sometimes fossil, detached entirely from every other body; 

 but are of that sort, which is perhaps never seen separate, or in any other man- 

 ner, when recent, than attached and fastened to other shells or stones , and they 

 are placed on this belemnites exactly in the same manner as they are commonly 

 foimd on other marine bodies, viz. lying on their broadest side, with their ridge 

 upwards, and glued as it were by a shelly substance. 



2. In fig. 4, at e is plainly to be distinguished, that the shell has been fashioned 

 thus by the convex surface of the belemnites, in the same manner as these shells 

 commonly receive a form from whatever substance they adhere to; which plainly 

 implies, that this shell was fastened to the belemnites when itself was very small, 

 and in a growing state; and that the shell in its growth was formed according to 

 the figure of the body on which it was affixed ; but such growth could not pos- 

 sibly have proceeded any where but in the sea; and therefore these two bodies 

 must necessarily have been in the sea at one and the same time. 



There is now but one way more, by which these shells, supposing the belem- 

 nitae to be stones sui generis, could possibly become affixed to them ; which is, 

 that the belemnitte might have been by some accident thrown on the sea-shore; 

 and that there the shells might fasten themselves to them, as well as to any other 

 stone. But as this must imply some former convulsion in nature, by which they 

 were cast out of their natural beds on the sea-shore ; and again a second convul- 

 sion to carry them to the chalk pit where they were found : so far-fetched an ob- 

 jection will, he believes, carry but little weight. 



Of a mixed Breed of apples, from the Mixture of the Farina. By Mr. Benj. 



Cooke, F. R. S. N° 49O, p. Qoi. 



Mr. C. sent last year a specimen of the effect of the farina of a rough coat 

 apple striking on the flower of a smooth coat; he has now sent an example of 

 the farina of the latter changing the former into its own dress and likeness. 



The situation of the russeting was such, that it was surrounded by winter 

 pippins, pearmains, and such-like; and they put the master fruit together with 

 several of the changelings, as they grew on the same branches mixed together. 



This instance will show what alterations may be expected in cognate species; 

 and he should have given an example of a kind of antipathy between the pear 

 and the apple in like circumstances, but was disappointed. 



j4 Description of the Town of Silchester in its Present Stale. With a Short Ac- 

 count of an Ancient Date in Arabian Figures at TValling, near Aldermarston 

 in Berkshire. By John IVard, F. R.S., P.R.G. N" 490, p. 603. 



In a former paper,* Mr. W. attempted to explain a Roman inscription cut in 



• Phil. Trans. N" 474.— Orig. 



