Fossil Bones and Pseudo-Coprolites of the Crag. 101 



/3, I have given below the numerical results of the analyses of 

 three different specimens : — 



Specific gravity- 



2-644 



2-874 



2-907 



Mean. 



Water driven off at 300° or 350° Fah. 

 Water and organic matters expelled 

 at a red heat .... 

 Carbonate of lime • 

 Carbonate of magnesia 

 Sulphate of lime 



Phosphate of lime . . . ) 



Phosphate of magnesia . . ( 



Perphosphate of iron . 



Phosphate of alumina 



Fluoride of calcium . 



Silicic acid .... 



2-000 



4*786 

 21*000 

 1-089 



0- 298 



58* 781 



6-600 



1- 200 



undetermined) 

 0-120 



2-760 



5-321 

 16-400 

 0-252 



a little 



61 • 



U i L 1 O 



9-400 

 0-400 



undetermined 

 0-261 



1- 976 



4- 679 

 17-600 



some 

 0-896 



62-721 



5- 200 



2- 416 

 4-167 

 0-200 



2-2453 



18-3333 



0- 3980 

 60-8923 



7-0660 



1- 3350 

 4- 1670(?) 

 0-1700 









98-855 



99-9826 



Nitrogen, per cent. . 



undetermined 



0-0838 



0-0482 





Table I. (page 102) and table II. contain my results in a con- 

 densed form :— - 



Fossil Bones. — Table II. 





1. 



2. 



3. 



4. 



5. 



Specific Gravity . . • - • 



2-6440 



2-8740 



2-9070 



2-5680 



undetermined 



Water driven off at 300°-350° Fahr. 

 Water and organic matter (by a red heat) 



Lime . 



2- 0000 

 4-7861 

 9-8108 

 0-1752 



30-9761 

 43-3687 

 0-5086 



3- 4738 



0-3892 



4- 1670 

 0-1121 



2-7605 



5-3210 



7-3480 



a little 

 32-9856 

 42-0962 



0-1200 



4-9474 

 some 



0-1298 

 undetermined 



0-1610 



1-9765 

 4-6796 

 7-7440 



0- 5270 

 32-9141 

 44-1061 



some 



1- 8943 



1-O60O 

 undetermined 

 0-1992 



3- 3611 



4- 3511 

 12-2503 



0-3024 

 28-3359 

 42-1204 



0- 1767 

 3-4738 



some 



1- 1027 

 3-6571 

 0-6160 



2- 9119 



3- 3616 

 10-6-218 



traces 

 32-9278 

 41-4636 



0-1362 



2-5264 



1'5041 

 undetermined 

 0-0980 



99-7676 







99-7475 





undetermined 



0-0838 



0-04S2 



0-1244 



undetermined 



The facts which I consider have been proved by the preceding 

 analyses are — 



1st. That the pseudo or false coprolites of the Suffolk and 

 Surrey crag are as rich in phosphoric acid as the true icthyo and 

 saurio coprolites of other formations. 



2nd. That the proportion of phosphoric acid in the pseudo - 

 coprolites and phosphorites varies from about 12*5 to 37 -25 per 



