220 WHEAT SOILS OF THIC ALKXANDKIA DIAISIOX . 



composition of nine typical wheat soils belonging to different 



lormations in the South-Eastern Counties. On each of these 

 soils wheat is at present grown successfully. 



The physical composition of these soils may be summarised 

 as follows : — 



Coarse and Fine Fine 



Fine medium sand and silt and 



gravel. sand. silt. clay. 



Thanet sand 1.2 ^.2 65.6 19.3 



Upper greensand 5.0 4.8 52.4 26.1 



Brick earth 0.9 1.3 51.5 29.2 



Clay-with-flints — 



' Loyterton t . i t .0 53 .6 28. i 



Coulsdon 1.7 5/ 47-0 29.6 



London clay — 



Tolworth 0.4 12.8 36.8 34.8 



Sheppey 0.5 0.3 3io 



I 



Alluvium 0.1 0.0 49.2 32.6 



Weald clay 0.5 2.^ 38.9 43-8 



The ten cultivated soils from Alexandria mav be tabulated 

 in the same way : — 



Fine Coarse and Fine sand Fine silt 



No. gravel. medium sand. and silt. and clay. 



I 0.0 5.9 71.9 22.2 



3 0.2 9.8 67.1 23.0 



5 o.i 42.1 45.1 12. S 



7 0.0 10.2 78 . 4 1 1 . 5 



9 0.0 25 . 7 64 . 6 9.7 



IT 0.0 4.6 76.6 18.8 



T3 0.1 30.5 533 i6.i 



15 0.3 3.4 78.2 17.1 



17 0.0 26.7 64.7 8,5 



T9 0.0 29.5 ,=i3.6 14.7 



Of these ten soils, six, Nos. 5, 7, <;, 13. 17 and k;. are at 

 once seen to be lighter all round than any of the wheat .soils 

 referred to by Hall and Russell. The remaining four .Alexandria 

 soils average 20 i)er cent, of fine silt and clay, as against 33 per 

 cent, in the nine English soils. The former are, therefore, the 

 lighter. I'lU'thcr than tliis, tliev are not easy to comi)are. for 

 Hall and l\u^sell draw the line l)etween line silt and clay at 

 .002 mm., instead of at .005 mm., as in my analyses. Bearing 

 this in mind, however, the differences between the fine silt and 

 day in the two sets of soils may l)e compared as follows: — 



Euf/lish Soils — Imm'.' •-ilt. Clay. 



Thanet sand 7.4 'i-9 



Upper greensand 12.9 i3-2 



Brick earth 13 -3 ^S-9 



Clay-vvith-tlints — 



Loyterton 9-4 '8-7 



Coulsdon - 9-6 20.0 



London clay — 



Tolworth !i.i 2,^.7 



Sheppey i5-3 .^^'-8 



