

ARE TO BE REJECTED. 75 



a The same Mr Wilson, in the same series of results, states 

 that, 



358 Ib. of guano per acre gave . 17 tons 3 cwt., and 



538 Ib. ... ... . 16 ... 6J ... 



where one-half more guano gave 16 \ cwt. less produce, the 

 manurings in neither case being extreme. 



b Mr Main, at Whitehill, in -1847, used dissolved bones, 

 mixed with wood ashes, prepared night-soil, sugar refuse, and 

 nitrate of soda, in raising green-top globe turnips. He applied 

 the mixture in three different proportions, with the following 

 results per imperial acre : 



Bulbs. 



1. With 1932 Ib. per acre, the produce was 22 tons. 



... 1732 1! " 



... 1532 21, 



Here the smallest quantity gave nearly as much as the 

 largest, while the middle proportion gave less both of bulbs 

 and of tops. It is unfortunate, also, that these three results 

 form a part of a series of eight experiments, the results of which 

 are tabulated,* and must have cost Mr Main much time and 

 expense. But for want of duplicate or triplicate experiments, 

 and the knowledge of the limits of natural error which such 

 experiments alone can give us, these, like many other carefully 

 conducted series of experiments already made and published, 

 fail to lead to any useful and trustworthy result. 



c On the farm of South St Colmar, in Bute, in 1847, it is 

 stated that 



6 cwt. of guano gave 30 tons 15 cwt. of turnips. 



5 31 ... 17 



4 32 ... 



the produce, as in Mr Wilson's case, increasing as the manure 

 diminished. 



d On the Kerrytonlia farm, in the same island, in 1847, 



24 carts of yard dung, with 16 bushels of bones, gave 27 tons 7 cwt. 

 24 14 29 ... 7 ... 



Being a difference of . . . . 2 tons, 



* Transactions of tie Highland Society, March 1849, p. 540. 



