36 Transactions. 



demand was great, we find all the manageable materials 

 removed while the less useful and unmanageable are left, 

 viz., the large and unwieldy masses forming the outer circle, 

 and the basement of the outer and inner sides of the 

 chamber wall. 



At Clava not only is the supply greater from the increas- 

 ed number of structures but the demand less from its isolated 

 position, hence here even the manageable matei'ials have 

 been only partially removed. 



May I further hazard a conjecture : may it not be in our 

 own neighbourhood, where, so far as I know, only one circle 

 occurs, the outer, as I suppose, that the absence of the two 

 interior are due to the greater demand for material in a 

 populous district. The slabs, of which these two are con- 

 structed, being always much less in size and therefore more 

 manageable than those forming the outer circle. 



Let me now say a few words as to the marking found. 



So far as I know those markings have not been hitherto 

 discovered or described, at all events they are not mentioned 

 in the last edition, 1863, of Anderson's well known scientific 

 Guide to the Highlands. I must state, however, that I am 

 not acquainted with and have not time to examine the 

 literature of the subject. 



These markings were found by my companion, Mr. 

 Browne, and myself, on the most southern of the three struc- 

 tures at Clava. 



The first on a slab in the basement of the interior face 

 of the chamber wall, contiguous to but on the western side 

 of and at the interior termination of the entrance passage. 



The slab was a tolerably fine sandstone, apparently in its 

 upright and original position, but covered with debris to an 

 unknown depth. 



Three to four feet square of its upper portion was ex- 

 posed, exhibiting ten markings seen in the diagram, and 

 which as to form, size, and relative position may be consider- 

 ed pretty exact, as they were transferred to the present 

 sheet from a rubbing taken on the spot. 



