Jan. 6-Mar. 31. 1919 IllustrationS IX 



Pace- 

 Plate 35. A. — Longitudinal sections of vanilla fruits. Left to right: Vanil- 

 lon, pistillate, X vanillon, staminate; vanillon, pistillate, X Vanilla 

 planifolia, staminate; Vanilla planifolia, pistillate, X vanillon, staminate; 

 Vanilla planifolia, pistillate, X Vanilla planifolia, staminate. B. — Com- 

 parative length of cleared columns and ovaries. Vanillon above. Vanilla 

 planifolia below 252 



A Field Study op the Influence of Orgaotc Matter upon the Water- 

 Holding Capacity op a Silt-Loam Soil 



Plate 36. View of Field J., Minn. Agr. Experiment Station Farm, showing 

 topography and surroimdings, looking from plot 6 to the bam which occu- 

 pies part of plot 1 278 



Fusarium-Blight of Potatoes Under Irrigation 



Plate 37. Effect of Fusarium-blight on seed pieces of potato: A. — Early- 

 Ohio seed pieces: Control above; pieces inoculated with F. oxysporum 

 below. B. — Early Ohio plant. See piece inoculated with F. oxysporum. 

 C. — Early Ohio seed pieces: Control (left) and inoculated (right) seed 

 pieces. D. — Seed piece well decayed, resulting from soil infection. E. — 

 Seed-piece rot in field 304 



Plate 38. A. — Inoculated and uninoculated stems of same potato plant. 

 B. — Potato plant (control), showing method of inoculating with wedge of 

 melilotus stem. C. — Seed-piece rot in field. D. — Potato plant naturally 

 infected by F. oxysporum in the field 304 



Plate 39. Potato stems showing seed-piece rot: A. — Stem split to show rot- 

 ting due to organism entering through seed piece from soil. B. — Stem split 

 to show slight discoloration at base where infection from soil-infected seed 

 piece occiured. C. — Seed piece of potato plant shown in Plate 40, B. 

 D. — Seed-piece rot in field 304 



Plate 40. Potato plants affected by Fusarium blight: A. — Potato plant late 

 in season with rolled leaves. Fusarium blight. B. — Top of potato plant 

 consisting of three stems. C. — Potato plant of two stems; one at left showing 

 Fusarium blight, or vnXt caused by seed-piece infection; one at right 

 healthy. D. — Plant Adth rolled leaves gradually dying from Fusarium 

 blight 304 



Plate 41. A. — A field of potatoes showing the result of unfavorable cultural 

 and soil conditions, by which seed-piece rot destroyed 60 per cent of the 

 stand. B. — A field of potatoes planted with whole seed (rows to right) and 

 cut seed (rows to left) at midseason 304 



Effect op Certain Grain Rations on the Growth of the White 

 Leghorn Chick 



Plate 42. A. — Lot i at the age of 3 months. B. — Lot 3 at the age of 3 months. 



C. — Lot 2 at the age of 3 months 31a 



TEXT FIGURES 



Determination of Acidity and Titrable Nitrogen in Wheat with the 

 Hydrogen Electrode 



Fig. I. Graphs showing the hydrogen-ion concentration of wheat extract on 



titration to Ph 7 6 



2. Graphs showing the hydrogen-ion concentration of wheat extract on 



titration Pa 8.3 6 



106547°— 20 2 



