396 



SCIENCE PROGRESS 



Wiltshire, was between 12 and 20 ft. thick in the Dover 

 section. Samples were assayed, and the following results are 

 interesting. 



Mr. R. H. Harland in forwarding the analysis writes : 



" With this I enclose results of analyses of samples of iron 

 ore, together with analysis of specimen, obtained by washing 

 away the clayey matter from the lowest four feet of material, 

 taken at a depth of 604 ft. 4 in. 



" The percentage of clean iron ore obtained was 57I per 

 cent., and a further 6 per cent., containing some clayey matter, 

 gave 33'49 per cent, of metallic iron, the two together making a 

 total of 74 per cent, of iron recovered in the washed material ; 

 or, taking the clear iron grains, only 70 per cent." 



Analyses of Samples of Dover Iron Ore, taken at the Works. By Edtvard 

 Riley, F.I.C., F.C.S., Metallurgist, Analytical and Consulting Chemist. 



Silica 



Peroxide of Iron 

 Protoxide of Iron 

 Alumina . 

 Oxide of Manganese 

 Lime 



Magnesia . 

 Phosphoric Acid 

 Arsenic Acid . 

 Sulphur . 

 Oxide of Copper 

 Carbonic Acid . 

 Combined Water 

 Moisture . 



Upper 6 feet. 

 I5IO 



38-54 

 6-56 



571 

 30 



9'94 

 i - 55 



'97 (Phosphorus -42) 



Nil 

 •084 

 Nil 



1 1 '43 



7*22 



2-08 



Middle 2 feet. 

 1 1 OO 

 55'24 



3*59 



575 

 •30 



5'23 

 114 



i"37(P. *59) 



Nil 



•063 

 Nil 

 410 

 9-90 

 2-18 



99-484 



Metallic Iron, per cent. . . 32'o8 



Loss on Calcination, per cent. 20"oo 

 Metallic Iron, per cent, on 



Calcined Ore . . . 40*10 



99J863 



41-46 

 1578 



49 - 23 



Lower 4 feet. 

 I2"00 



47-83 



8-39 

 4-88 



•20 

 442 

 176 



103 (P. -45) 

 Nil 



•16 

 Nil 

 8-48 

 8-38 

 177 



99-3o 



40 "oi 



17-70 



48-61 



The same iron ore occurred at Brabourne, Ropersole, 

 Waldershare and the latter borings; the degree of concentration 

 varies considerably : at Waldershare, a piece of core was 

 assayed, and returned a very poor yield, but the Oolites are 

 almost all heavily impregnated with iron in this hole. 



But the chief point of interest in connection with the Meso- 

 zoic rocks is that these borings all proved the thinning-out of 



