Ohio Agricultural Experiment Station, Second Series, 

 Volume IV, Number 3, August 1st, 1891. The super- 

 phosphate was dissolved bone black suppl3'ing onlj^ 

 phosphoric acid, nitrate of soda suppl3^ing onl^^ nitro- 

 gen, and muriate of potash furnishing potash. The 

 figures show interesting facts with regard to the chem- 

 ical composition of the plants at different periods of 

 growth, and more extensive analysis, especially of the 

 ash that are in progress, will reveal something with re- 

 gard to the physiological activity of the plant. As will 

 be seen from the tables the kind of fertilizer seems to 

 have some influence on the nitrogen contained. When 

 plat 13 (unfertilized) is considered, however, it would 

 seem that the influence is verv slight indeed. Plat 2, it 

 will be noticed, is lower in nitrogen than 13. Can the 

 fertilizer be the cause of this ? Such questions can only 

 be answered by a more extended investigation of the 

 phj^siological powers of plant life, through study of the 

 action of fertilizers under various conditions, and by 

 careful analyses of the resultant plant growth. 



Table I. 



No. 

 Plot. 



SAMPLES SECURED. 



April 25 April 29 



May 4 May 6 



May 9 ..» May 13 



May 16 May 20 



May 24 May 27 



May 31 June 3 



June 6 



June 13 (Stems). 



April 25 



May 4 May 3 



.May 9 May 13 



May 16 May 20 



May 24 May 27 



May 31 .June 3 



June 6 



June,^i3 (Stems) 



April 25 May 3 



May 4 May 6 



May 9 May 13 



May 16 May 20 



May_24 May 27 



May 31 .June 3 



June 6 



June 13 (Stems) 



Per cent. 



Nitrogen. 



1S02. 



Per cent. 



Nitrogen. 



iSo;. 



2-95 

 2.76 

 2.04 



Per cent. 

 Ash. 



9.S1 

 8.37 

 9.09 

 763 

 6.85 



11.09 

 8.94 

 9.90 

 7.09 



6.6s 



-13 



