102 



The Ohio Journal of Science [Vol. XVI, No. 3, 



the bottom of the pot until the last free water has disappeared 

 from the surface of the sand. A hemispherical clay funnel is 

 placed in position as shown in the photograph and the pot is 

 ready to receive the seedlings. After careful selection for uni- 

 formity, the seedlings, six in number, are planted equal dis- 

 tances apart on a circle drawn midway between the edge of the 

 funnel and the wall of the pot. Care is taken to have the 



Fig. 1. Granite-ware pots for the study of plant nutrients in sand cultures. 



seedlings at such depth that the top of the grain is just level 

 with the surface of the sand. After all of the seedlings are in 

 place the pinch cock is closed and the pot is tapped gently on 

 the top of the table until free water appears on the surface of 

 the sand. This manipulation serves to pack the sand around the 

 roots of the seedlings and at the same time to level off the surface 

 of the sand preparatory to putting on the seal of Briggs and 

 Shantz'-"' wax. 



"Bui. No. 230, Bureau of Plant Industry, U. S. D. A., p. 13. 



