214 Rev. W, D. Conyheare on a Geological Map of [Sept. 



urge the vacuity of the arteries after death as an objection to the 

 doctrine of our immortal Harvey. 



How far temporary accumulations of blood in the pulmonary 

 artery are a source of disease, I leave to the decision of time. 

 Yet I must say, that Dr. Traill's coinciding with my views on the 

 subject, has made me not a little sanguine, that my pathological 

 speculations are founded upon a substantial basis ; and I cannot 

 refrain acknowledging that I am gratefully sensible of my obli- 

 gations to Dr. Traill, for his kindness during the above inquiry, 

 ag well as at all other times. 



Article XII, 



Memoir illustrative of a general Geological Map of the principal 

 Mountain Chains of Europe, By the Rev. W. D. Conybeare, 

 FRS.&c. 



{Continued from vol. v. p. 359.) 



Chalk Formation. 



This formation appears to stretch through an area of great 

 extent, occupying the interior of the grand European basin, 

 reaching probably from the banks of the Thames to those of the 

 Dniestr ; or if we attach credit to the observations of Dr. Clarke, 

 even to those of the Don. It is not, however, to be understood, 

 that its beds can be traced continuously throughout the borders 

 of this area, so as to present an uninterrupted basset edge ; for 

 this holds true of its western limits in England and France 

 alone. In the central portions of Europe, it is greatly concealed 

 partly by the overlying of the more recent tertiary deposits, and 

 partly by the vast accumulations of diluvial debris, which veil 

 from observation the native rocks throughout so large a portion 

 of the north of Germany. 



(A.) Shores of the Baltic, 



The northern limit of this area may be traced in the line of 

 the Baltic on the island of Rugen, where chalky cliffs present 

 themselves on its northern coast, being found also on the neigh- 

 bouring continent, in Pomerania and Mecklenburg. Hence the 

 line appears to pass to the south of S-weden, where a small chalk 

 tract occurs near Malmo, crossing to the opposite coast of 

 Zealand, and including the small isle of Mona on the south. 

 Some account of these localities may be found in De Luc's 

 travels. 



From Mona, the line of the chalk has not been traced: it 

 probably traverses Holstein (where it is said to occur, probably 



