10 Experiments with different Top-dressings upon Wheat. 



the preceding plot, and it was plain to any one that the marl had 

 had no effect whatever. On analysis this chalk-marl was found 

 to have the following composition : 



Composition of Chalk Marl. 



Moisture .. .. 2'49 



Carbonate of lime 69'23 



Oxides of iron and alumina '36 



Phosphate of lime (bone-earth) '63 



Sulphate of lime trace 



Magnesia and alkalies *45 



Soluble silica 8'29 



Insoluble siliceous matter (fine sand) .. .. 18*55 



100-00 



Towards the end of July the crop was nearly ripe ; at that 

 time I could not notice any marked difference in the state of 

 ripeness of the crops on the 7 experimental \ -acres. 



The wheat was reaped in the first week of August, and 

 threshed out on the 24th of August, 1859, and the whole of the 

 produce of corn and straw carefully weighed : it was omitted, 

 however, to weigh the chaff and cavings. 



The following Table exhibits the yield of corn of each experi- 

 mental plot, and the produce calculated per acre : 



TABLE showing the Produce, in Ibs. and bushels, of Corn of Experimental 

 Plots of i -acre, and Weight and Bushels per acre. (Average weight 

 per bushel, 60 Ibs.) 



By direct weighings it was found that the weight per bushel 

 was in 



No. I. 

 II. 

 HI. 

 IV. 



60! Ibs. 

 60 



No. V 60 Ibs. 



VI 60 



,,vn 60$,, 



Practically speaking, there was thus no difference in the weight 

 of corn per bushel. Not having had much experience in filling 

 bushels of corn, I found that I could not always fill the bushel- 



