18 
INVESTIGATIONS ON ROTHAMSTED SOILS. 
Table 4. — Broadbalk wheat soils, etc. — Continued. 
Seventh 
) inches. 
Eighth 9 
inches. 
e 
03 
3ts, etc. 
a 
)ts,etc. 
CD 
'o 
c 
O 
'o 
a 
X 
u 
ture. 

tn 
g 
1 sto 
dry- 
6 
1 sto 
dry 
turo 
$ 
CD 
CO 
cS 
CD 
CO 
Tot 
Fin 
Stu 
Moi 
Tot 
Fin 
CO 
Moi 
P.ct. 
P.ct. 
P.ct. 
P.ct. 
P.ct. 
P.ct. 
P.ct. 
P.ct. 
1.44 
74. 18 
24.38 
2.72 
74.40 
22.88 
Plat Gab 
13. 75 
70.28 
15.97 
13. 59 
75.36 
11.06 
Plat Tab 
.55 
82. 07 
17.38 
1.79 
78.73 
19.48 
77. 78 
17.03 
4.15 
78.37 
17.48 
Plat llab 
12. 92 
70. 31 
...... 
16.77 
8.31 
73.84 
17.85 
Plat 12ab — - 
15. 62 
66.17 
18.21 
21.95 
56.63 
21.42 
Plat 13ab 
3.43 
70. 75 
25.82 
1.99 
73.82 
24.19 
Plat 14ab 
3. 64 
73.51 
22.85 
3.47 
72. 95 
23. 58 
Plat 15ab - 
10. 63 
72.39 
16.98 
7.43 
75. 66 
16. 91 
Plat 16ab -.- 
1.97 
74. 17 
23. 86 
2.32 
72.50 
25.18 
Plat 17ab 
19.77 
59. 35 
20.88 
4.91 
74.81 
20.28 
4.93 
76.11 
18.96 
.87 
80. 81 
18.32 
Average 
7.82 
72.26 
19.92 
6.12 
73. 99 
19.89 
Plat 5ab 
Plat 6ab 
Plat 7ab 
Plat 8ab 
Average 
a Stones retained by i-inch sieve. The fine dry soil includes stones passing through ±-inch 
sieve. 
Table 4 gives like results for the much more complete set of samples 
drawn in 1893. In that yea"r the sampling was not confined to 27 
inches, but was carried down in a great man}^ cases — in successive 
depths of !) inches — to 72 inches or 6 feet, while in the case of 4 plats 
a depth of 90 inches or 7^ feet was reached. And here I must make 
a public confession. During the sampling of 1893, Sir Henry Gilbert 
was here in America lecturing, and Sir John Lawes was superintend- 
ing the work of sampling at Rothamsted. I happened to go to see 
him while the pits excavated for sampling the wheat plats were open, 
the full depth of 90 inches having been reached only in four cases. 
I was much interested in the sampling, as a set, of the samples was 
promised to me for investigation in regard to the phosphoric acid 
and potash constituents, by a process which I had then recently 
applied, with very interesting results, to the examination of the bar- 
Ninth 9 inches. 
Tenth 9 inches. 
P.ct. 
3.98 
3.17 
3.05 
.77 
2. 74 
P.ct. 
72. 81 
82. 26 
77.73 
82. 51 
P.ct. 
P.ct. 
23. 21 
14. 57 
19. 22 
16.72 
P.ct. 
12. 34 
3.19 
4.47 
.10 
78. 83 
18.43 
P. ct. P. ct. 
67.33 
79.68 
77.44 
84.79 | 
77.31 _ 
P. ct. 
20.33 
17.13 
18 09 
15.11 
17.66 
