109 
Their hardness varies somewhat, but is never high. No. i has 
the hardness 2-3, and No. 2 is 2*0. The density of both is 
about 2*5. 
The following are the analytical results from two of these 
calcareous materials : — 
Calcareous Marl. Marly Limestone. 
No. I. 
No. 2. 
Silica 
27-18 . 
• 5-31 
Alumina and ferric oxide 
ii'95 • 
2-23 
Calcium carbonate (carbonate of 
lime) 
45*97 • 
. 82*49 
Magnesium carbonate (carbonate 
of magnesia) .... 
i3'55 • 
• 4'05 
Other substances and loss 
1*35 • 
5'92 
I00"00 
. 100.00 
The following specimens belong to this division as to 
material : — 
Case A 48, No. 7, Case A 49, Nos. 2, 3, and 25 ; Case C 
34, No. 6, the white variety; Case C 34, Nos. 8, 10, 12, the 
marbled variety; Case C 35, Nos. 3 and 5; Case C 36, No. 9. 
Case C 37, No. 6, shows a darkening of one part. A dis- 
colouration probably produced by a process similar to the 
"stifle" burning by which the dark colour of the Roman 
pottery, known as Upchurch ware, seems to have been pro- 
duced. Of course, the effect in the case now considered was 
an accidental result of the cremation. 
A. H. CHURCH. 
Royal Agricultural College, Cirencester, 
December, 1869. 
