M. T). (ilANNE AND V. CI. JaCKSON 



251 



data compiled hy Lavves and Gilbert from manurial experiments on 

 potatoes in Little Hoos field during the years 1876 1900. They deter- 

 mined somewhat roughly the specific gravity and the percentage of dry 



Table XII. 



1-110 

 1105 

 1-100 



■? 1095 



g 



o 



1 1090 

 1085 

 1-080- 



■^ + 



+ 



+ 



21 



22 



25 



25 



28 



23 24 



% tlry matter 



Fig. 9. 



matter of 250 samples, each consisting of about 30 tubers. These results 

 are represented grapfiically in Fig. 10. The correlation coefficient ob- 

 tained for this series was + 0-875 ± 0010. In view of the seasonal 



