Dec. 13. i9'5 Translocation of Constittients of Seeds and Tubers 457 



Table IV. — Percentage distribution of the mineral constituents of corn seedlings 



A comparison of these individual mineral constituents shows that 

 except in the case of potash approximately 50 per cent thereof have 

 been translocated from the cotyledons to the several parts of the seedling 

 during growth, and that the translocation of potash is greatly in excess 

 of that of the other mineral constituents. The taking up of such con- 

 siderable amounts of iron and aluminum from the aluminum cups in 

 which these seedlings had been grown and the great accumulation of 

 aluminum on the roots of the seedlings is also a matter of interest, al- 

 though it has no immediate bearing on the subject under consideration. 

 It is also evident from the foregoing that there is a decided accumulation 

 of translocated mineral matter in the leaves of the seedling, a fact that 

 is in harmony with the rapid growth of the leaves as compared with that 

 of the other parts of the seedling. 



EXPERIMENTS WITH POTATOES 



In the experiment with the potato tuber we have allowed potatoes to 

 sprout in a dark closet, after they had been thoroughly cleaned. When 

 the tubers began to soften they were removed from the dark closet and 

 the sprouts (i) cut off. The potato was then carefully pared and the 

 skin (2) and the starchy tissue (3) were carefully dried and ashed and 

 the quantities of calcium, magnesium, phosphorus, potassium, and sili- 

 con were determined. The results are shown in Table V. 



Table V. — Analysis of separate parts of sprouted potatoes 



