408 APPENDIX I. 



that the primary cause of the clover disease is attributable to a 

 change in the chemical composition of the plant, which again is 

 caused by an altered condition of the soil. The very consider- 

 able deficiency of phosphoric acid and potash in the ash of the 

 diseased plant is certainly remarkable (' Zeitschrift der land- 

 wirthschaftlichen Centralvereins der Provinz Sachsen, 1861,' 

 page 73). 



