596 
FACTS FROM VARIOUS SOURCES. 
THE WHEAT EXPERIMENTS OF LAWES.—The experiments of Mr. J. 
DB. Lawes, of Rothamstead, England, in growing wheat continuously 
on the same plots, one unmanured, one treated with farm-yard manure, 
others with commercial fertilizers, are well known, having been contin- 
ued now twenty-two years. The following table gives the production 
for each of the past eleven years, the average for that period and also 
the average for twenty-two years: 
Bushels of dressed corn per acre. 
2 z oi Artificial manures. £ 2 Ss 
sa | 38 ae lee 
Harvests. as a og | 85 
aa ad = rea} a eo SS 
o miagge-|. 8 °| S)) eae 
Z fA Ay B ey a ae 
HSUBY ssa da Saas co ese sts 4 sess ses sede 5508 174 44 533 558 Dos 545 38¢ 
US Te CoS Sheol aeb ceo SERS Sass 95 se SS SSk5, 164 40 453 402 51 49 354 
U3.PS) ced oS cedasensssate Sse aScelshne ssc ape Se | 133 37s | 404 43 | 44 42 31 
Tee 5 Gao cet Bo sae ER aD eu 328 | 30 324 32 31h. | 254 
GIST 2 = ot Asti asso sss ae eases 4 | 85 203 224 303 294 272 21¢ 
LiSIRSY 9 So ek Sk 8 ban Sateige Sse ae Sebo ee ee eee 163 41¢ 395 463 47¢ 44% 343 
TER AO pe Be Se hee Se eh A ae Ae Rk ig a ig 142} 384] 288 313 39 344 | 28 
SSD eoeteee neon eters eae cies me cleasoelsnelaee aes 15 | 343 403 45t 454 43$ 31; 
TS ae re tet es re tT EE ie oe ea oe 94 39 22 Q78 342 28k} 254 
LGC 5.455 BER SIN Sa BE OC OS DEC soo aoe aa pS 10% 32% 293° 354 40% 353 264 
UC) 2 esd aS ee sous edn cOn ae Hovabe= SabaSges wae 11? | 262 | 22 274 355 284 | *22¢ 
Average for eleven years, 1863-73 ....-. 134 36 34 39 41z 38h 4294 
Average for twenty-two years, 1852-’73.. 144 354 342 37f | 37 362 | {28% 
Weight per bushel of dressed corn. 
: &é , a ee 
¢ a0 Artificial manures. Ss ea 
= TS Aa | ae 
= 23 = at M 1) se a 8 
Harvesis. es a | : om | oy 
Fa | gs x 06 o aS 5ftee 
° ws | € 3 iS) Shes 
A = oe ee” Ay Ay a a 
Lbs Tbs. | Lbs. Lbs Lbs Lbs. | Lbs. 
62. 7 63.1 62.5 62.3 62.1 62.3 62.7 
62.0 62.5 63.1 63.5 62.6 63.1] 62.5 
60. 6 61.5 61.6 61. 4 61.1 61.4 | 61.2 
61.3 61.7 61.0 60. 1 60. 6 60.6 | 61.2 
54.1 61.4 | 61.0 60. 7 59. 9 60.5 | 59.4 
61.0 61.6; 61.1 62. 7 61.1 61.4 | 61.3 
56. 1 56.9 | 57.4 57.2 Sy Hi! 57.2 | 56.8 
61.7 63. 4 63.3 63.0 62.7 63.2 | 62.8 
54.8 60.0 | 56.6 ov. 7 58. 6 57.6 |. 57.5 
50. 0 GON >) 6082 60. 4 60. 0 60.2 | 60.0 
57.10 o7.1)} 58.1 DOL Oi otk 57.0 | *57.4 
Average for eleven years, 1863-73 .....- 59. 3 61.0 | 60.4 60.5 60.3 60. 4 | 160.2 
Average for twenty-two years, 1852-"73..} 57.6 60.0} 59.2 59.0 58. 4 58.9 | {58.8 
* Equal to 21 bushels at 61 pounds per bushel. + Equal to 28% bushels at 61 pounds per bushel. 
t Equal to 273 bushels at 61 pounds per bushel. 
Mr. Lawes gives the following statement in explanation of the pecu- 
‘liarities of the season, with deductions from the tabulation above pre- 
‘sented: 
