XIV Journal of Agricultural Research voi. vi 



Page 



Plate LXXVII. Cowpeas, showing the comparative effect of Tennessee brown 



rock phosphate alone and in combination with dextrose 514 



Plate LXXVIII. Cowpeas, showing the comparison of their growth when 

 treated with Tennessee brown rock phosphate, phosphate and dextrose, 

 and phosphate, dextrose, and calcium carbonate 514 



Plate LXXIX. Effect of different substances on the growth of cowpeas: Fig. 

 I. — Growth after the addition of varying quantities of raw rock. Fig. 2. — 

 Growth after the addition of dextrose and soluble phosphate 514 



Plate LXXX. Effect of various substances and combinations on the growth of 

 cowpeas: Fig. i. — Effect of adding lime, phosphate rock, dextrose and 

 lime, and phosphate rock, dextrose, and lime to the soil. Fig. 2. — Effect of 

 adding nothing, lime, phosphate rock, and phosphate rock and lime to the 

 soil 514 



Storage-Rots op Economic Aroids. 



Plate LXXXI. Fig. i. — A dasheen conn {Colocasia esculenta) showing Java 

 blackrot produced by Diplodia tubericola. Fig. 2. — ^A conn of Alocasia sp. 

 showing Java blackrot produced by D. tubericola. Fig. 3 . — A dasheen tuber 

 partially decayed by Sclerotium rolfsii 572 



Plate LXXXII, Fig. i. — A tuber of Colocasia esculenta showing a powdery 

 grayrot caused by Fiisarium solani. Fig. 2 . — A tuber of Xanthosoma sagitti- 

 folium showing partial decay by Fusarium solani. Fig. 3. — ^A tuber of 

 C. esculenta softened throughout by Sclerotium rolfsii 572 



Plate LXXXIII. A corm of Colocasia esculenta from Brooksville, Fla., mostly 



rotted away by Bacillus carotovortis 572 



Influence op Calcium and Magnesium Compounds on Plant Growth 



Plate LXXXIV. Fig. i. — Growth of wheat in sand containing varying quan- 

 tities of calcium and magnesium. Fig. 2. — Growlh of alfalfa in sand con- 

 taining varying amotmts of calcium and magnesium 620 



Plate LXXXV. Fig. i. — Growth of soybeans following a crop which had al- 

 ready absorbed most of the readily available calcium and magnesium. 

 Fig. 2. — Growth of soybeans in soil treated with magnesium 620 



Plate LXXXVI. Fig. i. — Comparative growth of soybeans in brown silt 

 loam and dolomite, showing that the loam would have been improved by 

 the addition of some limestone or dolomite. Fig. 2. — Soybeans in sand 

 treated with magnesium, showing that their growth increases inversely 

 with the quantity of magnesium applied as sulphate 620 



Plate LXXXVII. Comparative root production of wheat grown in the chlo- 



rids, sulphates, and carbonates of magnesium and calcium 620 



Plate LXXXVIII. Fig. i. — Comparative growth of wheat in sand and in 

 dolomite. Fig. 2. — Comparative gro\\lh of wheat in magnesium chlorid 

 and magnesium sulphate 620 



Larval Characters and Distribution op two Species op Diatraea 



Plate LXXXIX. Fig. i. — Diatraea saccharalis cramhidoides: Larva, summer 

 form, dorsal view. Fig. 2. — D. zeacolella: Larva, summer form, dorsal 

 view. Fig. 3. — D. saccharalis cramhidoides: Larva, summer form, side view. 

 Fig. 4. — D. seacolella: Larva, summer form, side view. Fig. 5. — D. sac- 

 charalis cramhidoides: Larva, winter form, dorsal view. Fig. 6. — D. zeaco- 

 lella: Larva, winter form, dorsal view 626 



