Maine State College Experiment Station Report, 1895. Plate II. 

 Clover, immature. 



Clover, mature. 



Box 1. Soluble Phosphoric Acid. 



Box 2. Insoluble Phosphoric Acid — Florida Kock. 



Box 3. Insoluble Phosphorate of Tron and Alumina 



Box 4. No Phosphate added. 



