246 
Thus, again, Risler, at Caléves, in France, measured the harvest 
and the rainfall in an open field, having an impermeable subsoil. 
He measured the quantity of rainfall and the outflow through the 
drains, and allowed for the moisture in the soil at the beginning’ and 
end of his experiments. The result attained was that a field of winter 
wheat consumed 256 millimeters in depth of water from April to July. 
He does not give the quantity of grain that was harvested. 
Marié-Davy, at Montsouris, cultivated winter wheat in twelve sam- 
ples of earth of very different qualities, in 1874. The soil was 
enriched with compost, with results as in the first part of the follow- 
ing table. 
In 1875 the soil was enriched with Joulie’s complete fertilizer for 
cereals at the rate of 1,000 kilograms per hectare, with results as in 
the second part of the table. 
Evaporation and crops at Montsouris. 
Experiment of 1874. Experiment of 1875. 
aa ae Evapo- | Crop, | Ratio. | EYP | crop. | Ratio. 
Kilos. |Grams. Kilos. |Grams. 
dS a ee ee ee Se Seah ne eben 380 394 | 964 362 394 919 
Die See Se Ub a Ro ea SEES Me cree Ol Wong oat one 360 187 | 1,924 856 372 957 
a ee a oe ee ee re 348 300 | 1,160 345 474 728 
7 le ee BE a ee ee ep nae Meal I ee 347 380 913 364 479 760 
Lip fA Reka ae BOS pela Pa es eee a ae ees BAC Eee es 340 303 | 1,122 356 425 837 
Greate eee mio Eee SUES See eee ae 365 256 | 1,426 363 262 1, 386 
a eee GA Bee ie ene ne a oie a | 344 328 | 1,049 366 435 841 
Oper FALL ee ret ee Be ee ee ek oc B29 324 | 1,015 344 424 811 
Operas eee Aire bor et ees Race eee ee 389 312 | 1,086 346 387 894 
(1 Oe bike Hai So Ses eh Ee eee 359 308 | 1,165 366 379 965 
10 tes ee ee eR eee a See S 346 313 | 1,105 | 346 469 738 
LP RREAI aes Se owen eee! oe ER Sean soe aes | 372 236 | 1,576 | 363 | 379 958 
AN CVE PCRs kaos sees aoe ce cea eee 352 303 | 1,140 | 356 407 877 
We remark that in these two years the quantity of water evaporated 
has remained the same, but the harvest changed notably, being in 
both cases much superior to those of Rothamsted and Caleéves. A 
box of earth, similar to those containing the wheat, lost by evapora- 
tion from January 26 to June 9, 1875, 114 millimeters, while a box 
planted with wheat lost 356 millimeters, and the Piche evaporimeter 
lost 302 millimeters. Similarly, in 1876, from the 22d of February 
to the 5th of July, the soil covered with winter wheat lost 426 milli- 
meters, but the naked soil 163 millimeters and the Piche 465 milli- 
meters. However, in this connection it must be noted that while the 
boxes containing naked soil received only the natural rainfall, those 
containing the growing plants received weekly the water that they 
a 
