374 



EXPERIMENTAL STATIONS — TUENIP CEOP 1882. 



by more than 1 per cent, of the total ash, other two samples 

 were incinerated side by side, and the average taken. When 

 the samples are made wdth the utmost care as to fine grinding 

 and thorough mixture, and the whole process carried out with 

 perfect uniformity in every particular, a difference of 1 per 

 cent, of the total ash rarely occurs. It will be seen from Table 

 VII. that when every precaution has been taken to eliminate 

 variations due to analysis, there are considerable differences in 

 the percentage of ash over the plots on the station, but it 

 would be a mistake to suppose that these are entirely due to 

 difference of manurial treatment. Two turnips taken from the 

 same plot, and even growing side by side and resembling each 

 other in size and external appearance, do not always agree in 

 the percentage of ash they contain. Individual turnips differ 

 from each other in this respect, and when the turnips are of 

 different size and firmness, there may be a wide variation in the 

 percentage of ash. This irregularity may be minimised by 

 increasing the number of roots from which each sample of dry 

 matter is made ; and while that has been done in an extra- 

 ordinary manner in this investigation, there is no doubt that 

 the figures before us must still be looked upon as approxima- 

 tions only, in considering how far manuring of different kind 

 affects the amount of ash in turnips. As a rule, it is noticed 



No, VIII. — Percentage of Ash contained in Dry Matter. 



Undissolved Phosjjhates. 



