Report of the National Vaccine Estalllskment. 153 



The first of these cliflTcrences aopears to result chieflv from 

 the existence of numerous beds or patches, the formation 

 of which must have depended on certain local circumstances, 

 such as the e<istence of fresh or salt water lakes, at the 

 period of the dryina; up of a former ocean ; the different 

 chemical combinations which might thence have taken 

 place, &c. But the oc-currence of such variations can hardly 

 be considered as interrupting; the contniuity of the stratifi- 

 cation. 



Indeed, wheti it i« considered that in France much more 

 frequent opportunities are afforded of examininc; the strati- 

 fication immedia'elv above the cha'k than in Eneland, it 

 will not be regarded as improbable, that several of these beds 

 or patches may exist here, the discovery of which would 

 render the accordance of the two series of strata much more 

 close. 



Even from the examinations which have been already 

 made, the identity of the French and English chalk is esta- 

 blished. The British strata above the chalk are also found 

 to contain patches of plastic clay, of most of the varieties 

 mentioned in the French strata, as well as patches of coarse 

 limestone, with its accompanying sand and its peculiar fos- 

 sil shells, such as are found to exist in the corresponding 

 French strata. 



The other difference, the existence, in France, of beds of 

 sand and of sandstone above those of gravel, which are the 

 highest strata of this island, is very remarkable. Mav it 

 not be attributable to the abruption, from this island, of the 

 superior strata or beds of this formation, by that catastrophe, 

 instances of the astonishing force of which have been al- 

 ready noticed ? 



XXXI. Report of the Ncitmial Facclne Establishment. 



JL HE Board of the National Vaccine Etitablishment having 

 learned that great interest has been excited in the public 

 mind, by Ihe occurrence of small-pox afier vaccination, in 

 the families of the Earl of Groyvenor and of Sir Henry Mar- 

 tin, Bart, have thought it their duty to lay the foljowmg 

 cases before the public, acconij)anicd with some ob-erva- 

 tions, and a statement how far, in their o])inion, these cases 

 affected the general advantages of vaccination. 



The case of the Hon. Robert Grosvenor, third son of the 

 Earl of Grosvenor, was procured through the favour of Sir 



Henry 



