MR. HORNER ON THE ALLUVIAL LAND OF EGYPT. 
129 
mao'nifier any quartz crystals with their faces entire, nor any scales of mica. As it 
effervesces briskly with acid, the white particles are probably carbonate of lime. From 
the apex of the Delta, on the left bank of the Rosetta branch, behind the dyke, at a 
depth of 16 feet 4 inches from the surface. 
Silica 71'76 
Alumina 10‘40 
Sesquioxide of iron 7*81 
Carbonate of lime 6'77 
Magnesia 0’76 
Organic matter 2‘50 
100-00 
K. — Sand very similar to I, hut more exclusively quartzose and with a few scales 
of mica, with some hard concretions of sand. Fiom the right bank of the Damietta 
branch, at a depth of 31 feet from the surface. 
Silica 85-31 
Sesquioxide of iron 5-98 
Sesquioxide of alumina 1-72 
Alumina 1-04 
Carbonate of lime 3-64 
Organic matter 2-31 
100-00 
L. — Brown quartzose sand, very similar to K. Taken from the surface, near the 
river, at the time of low water, on the left bank of the Rosetta branch. 
Silica 83-21 
Sesquioxide of iron 6-01 
Sesquioxide of alumina 4-09 
Carbonate of lime 4-72 
Organic matter 1-97 
100-00 
M. — A light brown sand, consisting almost exclusively of transparent quartz with 
a few minute brown and green particles interspersed, effervescing slightly with acid. 
From the same locality as L, but from a depth of 67 feet 3 inches from the surface. 
Silica 96-93 
Sesquioxide of iron 2-05 
Sesquioxide of alumina 1-02 
Lime trace 
100-00 
It will be seen that the two specimens of the present superficial Nile mud, B and 
C, taken from localities widely apart, although consisting of nearly the same ingre- 
dients, differ considerably in the proportions. But in a deposit of this mechanical 
nature, it is probable that no two specimens, although taken from localities near to 
MDCCCLV. T 
