30 PROF. T. G. BONNEY ON THE NARBOROTJGH DISTRICT. [Feb. 1 895, 



New Pit W of Narhorousb 1 0-62 ( ( Mean of 4 8 P ecimens > ranging 



^ew rit, vv . ot xMarborongii - w { f rom 2-608 to 2-623.) 



NarboroughPit* 2'65 {(Mean of 3 specimens ranging 



[ from 2-643 to 2-652.) 



fHunoote 2-66 1 ( Mean of 3 s P ecimens > ranging 



111,110016 ^ m \ from 2-656 to 2-659.) 



Croft Hill j p . p|. 9./.0 j (Mean of 4 specimens, ranging 



1 J { from 2659 to 2701.) 



f Pit S.E. of the village... 2-68 { ^^"J $$$«» giving 

 Enderby ] Eaton's Pit 2-69 . { %*£ ^-giving 



^ Enderby Company's Pit 2'70 (1 specimen.) 



Stony Stanton, pits near the village 2-69 ( ( 2 % e f m To -n S OTent pitS ' 



17 x 6 [ 2'684 and 2-704.) 



x> „ xi-ii /The quarrv in work . 2-73 (2 specimens, 2-732 and 2 - 734.) 

 BairowHlll l The old quarry 2"72 (1 specimen, 2-718.) 



Sapcote, pits S.W. of the mass 273 { ^^^y^* 60 * ^ 



Charnwood (for comparison). 



Mount Sorrel 2-63 (A second specimen, 2657.) 



Felstone-dyke in same 2*60 



p , f Compact reddish variety... 2 - 65 Sheet Hedges Wood; 2 - 675, 



^ ro »y { Ordinary rock 2-73 [Pool Pit. 



Markfleld 2-83 



Brazil Wood diorite , 2"84 



Garendon (New Cliff) 2"98 { ^ ^^ s P ecim ens, 2-979 



Warwickshire. 



Nuneaton Quarry, near the Midland ] pn ,„ ,, , -> . 



•p, -i t t f (Rather decomposed.) 



Quarry, by Farm, 1J mile on the \ 2-73 (Fine-grained specimen.) 

 Coventry Road ... J 2-85 (Coarse-grained specimen.) 



Minute accuracy, it is well known, cannot be secured by this 

 method of weighing, but I think that the results given above would 

 not differ materially from those which might be obtained by more 

 delicate instruments. They are a little different from what I had 

 anticipated. The rocks of the two pits west of Narborough appear, 

 macroscopically and microscopically, to be barely distinguishable, 

 yet they differ in specific gravity by *03. In more than one case 

 specimens from the same pit vary considerably. In the Croft Pit 

 the difference is fully -04. There is an increase in weight eastward 

 and westward from the new pit between Narborough and Hun cote, 

 and the heaviest rocks are those of Sapcote and Barrow Hill. I had 

 expected the specific gravity of this last to have come out alone as 

 the highest in the group ; the result, however, justifies our classing 

 it with the others. Again, in the case of the large massifs, the 

 rocks at the southern ends seem slightly heavier than those at the 

 northern. Our comparison of the lighter-coloured variety of the 

 Forest syenite with the rocks of this group is also justified ; for the 

 specific gravity of the specimen from Sheet Hedges Wood Pit agrees 



1 The difference between the specific gravities of these two rocks, which seem 

 very similar, may be due to the fact that the specimens of the first are at present 

 a little more decomposed than those from the second locality. 



