OF THE SAME APPLICATIONS. 51 



59J and 86 stones of rape-cape respectively, there was reaped 

 per imperial acre 



Rape-cake applied. Market corn. Weight per bush. Light corn. 

 a First plot, . 59^ stones. 26 bush. 52^ Ib. 46 Ib. 



Second plot, . 59^ ... 21 ... 50| ... 67 ... 



b First plot, . 86 ... 28 ... 53 ... 35... 



Second plot, . 86 ... 22 ... 61 ... 91 ...* 



So that, in these two cases, there was a difference of five bushels 

 an acre in the crop, and two pounds on the weight per bushel, 

 from twice two portions of the same field similarly treated. 



Here, also, we have no means of knowing how much of 

 the difference was owing to original differences in the soil, 

 which the eye cannot detect, and how much to differences in the 

 mode of action of the manure. 



3. But the effect of similar applications is not only different 

 in amount on many occasions, it is also different in kind. Thus 

 Mr William Murray, at Slap, in Aberdeenshire,t obtained from 

 two several eighths of an acre, manured with 20 bushels of 

 bone-dust, the following weights of turnips, with and without 

 tops and tails, per imperial acre 



Gross weight. Bulbs, topped and tailed. 



First portion, . . 13 tons 11 cwt. 8 tons 3 cwt. 

 Second portion, . 13 ... 1 ... 10 ... 10 ... 



Difference, . . 10 cwt. 2 tons 7 cwt. 



Thus the relative weights of the tops and tails, and of the bulbs, 

 in the two portions, was at the rate, per imperial acre, of 



Tops and tails. Bulbs. 



First portion, . . 5 tons 8 cwt. 8 tons 3 cwt. 

 Second portion, . . 2 ... 10 ... 10 ... 10 ... 



We can hardly avoid concluding, that in this case an original 

 difference in the soil of the two portions must have caused the 

 one to run so much to top ; in other words, to continue to grow 

 so much longer, and to be so much later in bulbing, than the 

 other. The gross weight of the crops was nearly equal, but 



* British Husbandry, i. p. 412. 



t Transactions of the Highland Society, July 1845, p. 7. 



