130 Revieios and Notices of Boohs. 



Thus it will be seen by turning to tbe table referred to in 

 the note,* that, in 1844, when there were only 81 rainy days, 

 and when the mean summer temperature was 57° 5', the farm 

 produced 16 bushels of corn to the acre, and the weight of the 

 bushel was 60J lb., whilst the grain bore to the straw as high a 

 ratio as about 82 to 100. 



" In 1846, when there were 93 rainy days, and when the mean 

 temperature was as bigli as 59°, the yield was about 17 bushels 

 per acre, and tlie weight of a bushel 68 lb. ; but the proportion of 

 grain to straw was lower, namely 76 to 100, showing that the 

 yield of corn had been influenced by temperature, but that the 

 quantity of straw had been increased by the amount of rain. 



" Lastly, in 1845, when the number of rainy days was greater, 

 though the temperature had been lower than in either of the two 

 other years, — the former being 1 10, the latter 55, — the yield was 

 much greater, amounting to 23 bushels per acre, but the weight 

 of the corn per bushel less — namely, 56 lb. ; and the increase in 

 the produce of straw such, that the grain only bore to it the pro- 

 portion of 49 to 100. 



" These figures appear to show that, although the greater quan- 

 tity of rain was favourable to the amount of grain, yet that it tended 

 to increase in a still greater ratio that of straw ; and that the 

 higher the temperature of the year was, the heavier the grain 

 would prove, so as to make up in quality for its deficiency in 

 actual quantity. 



" Thus it would appear, that, under the same treatment, the 

 produce may vary in the proportion of 7 bushels per acre, accord- 

 ing to the difiference of season, which is equivalent to one quarter 

 of the normal produce ; or, calculating this at 30 million quarters 

 in a good year, may be as much as 7i million deficient." 



* The following table indicates the effect of climate upon the quantity and 

 quality of the produce of the unmanured piece of the experimental wheat-field, 

 (during three seasons) ; the average results of the variously manured, &c., are 

 also given : — 





1844. 



1845. 



1846. 



Corn per acre in bushels, . . . 

 Straw per acre in pounds, .... 

 Weight of Corn per bushel in pounds, . 

 Percentage of Corn to straw (straw 1000), . 



16 

 1120 . 



58-1 

 821 



23 

 2712 

 561 

 534 



17-25 

 1513 



681 

 797 



Mean of all the Plots. 









Weight of Corn per bushel in pounds, . 

 Percentage of Corn in straw (straw 1000), 

 Mean temperature, ..... 

 Rainy days in 30J weeks, .... 



601 

 868 

 57° 5' 

 81 



561 

 490 

 55° 2' 

 110 



63 

 765 

 59° V 

 93 



