1885.] Report on the Deposits of the Nile Delta. 225 



ments of a clear glass exhibiting strain-phenomena by polarised light 

 — probably of artificial origin. 



Mud. — Almost wholly composed of very fine-grained, inorganic 

 particles. 



Sample 12. Depth, 75 ft. 



Lighter coloured, sandy clay. Consists of 66*38 per cent, sand, and 

 36*62 per cent. mud. 



Sand. — Of very different degrees of fineness, the coarser grains 

 being nearly all well rounded. The usual minerals are seen, including 

 very fine microcline and large pieces of muscovite. 



Mud. — Consists of inorganic particles, none very fine. Quartz, 

 felspar, and hornblende can be recognised among the larger ones. 



III. Boring at T'antah. 



Sample 1. Depth, 4 ft. 



Dark coloured mould. Consists of 1*71 per cent, sand, and 98*29 

 per cent. mud. 



Sand. — Generally angular or subangular, with some rounded 

 grains. Many fragments of brick, and some splinters of green, glass. 

 Many calcareous concretions. Much carbonaceous matter.. 



Mud. — Consists principally of organic matter, with some mineral 

 fragments. 



Sample 2. Depth, 8 ft. 6 in. 



. Hard brown clay. Consists of 7*27 per cent, sand, and 92* 73 per 

 cent. mud. 



Sand. — Contains both coarse, rounded grains and finer, angular or 

 subangular ones. Quartz, hornblende, and the other minerals usually 

 present are represented. Pale coloured granular calcareous particles. 

 Dark coloured argillo-calcareous particles (like those represented on a 

 large scale at greater depths). 



Mud. — Generally very fine grained, with some organic particles. 



Sample 3. Depth, 18 ft. 



Hard brownish clay. Consists of 8*78 per cent, sand, and 91*22 

 per cent. mud. 



Sand. — Made up of granular calcareous particles, with only a few 

 grains of sand, rounded or angular, consisting of quartz and the usual 

 minerals. One fragment of red brick, and a number of particles of 

 black slag, full of bubbles (resembling slag of Roman iron-furnaces). 



Mud. — Contains some coarse particles of different minerals. 



■Q 2 



