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Seed Disinfection by Formaldehyde Vapor 

 Fig. I. Formaldehyde-vapor disinfecting apparatus 34 



Influence of Soil Environment on the Rot op Tobacco 



Fig. I. Soil-thermograph, records showing the influence on soil temperature of 



the shading of soil by growing tobacco 68 



2. Soil-thlrmograph records given comparison of a typical record of 

 regulated soil temperature in tanks with a typical record from the 

 field at a depth of 4 inches 69 



Relation of Weather to Fruitfulness in the Plum 



Fig. I. An outline drawing of an anther of Minnesota No. 12, showing the ad- 

 justment which takes place as a result of taking up or giving off water: 

 A, an anther which has been open in the orchard for three days; B, 

 the same with the anthers pushed up to show the dead area at the 

 upper end of the filament; C, the appearance of the anther after two 

 minutes in water iii 



Structure of the Maize Ear as Indicated in Zea-Euchlaena Hybrids 



Fig. I. Diagram showing arrangement of pedicelled and sessile spikelets in A, 

 undifferentiated four-rowed branch; B, eight-rowed ear, the result of 

 the fasciation of two undifferentiated branches; C, eight-rowed ear 

 the result of twisting a single undifferentiated branch; D, i6-rowed 

 ear, the result of fasciation; E, i6-rowed ear, the result of a further 

 twisting of " C" 129 



Carbohydrate Metabolism in GrEEn Sweet Corn During Storage at 

 Different Temperatures 



Fig. I. Depletion of total sugars in green sweet com during consecutive 24-hour 



periods of storage at different temperatures 146 



2. Depletion of sucrose in green sweet corn during consecutive 24-hour 

 periods of storage, expressed as percentages of the initial sucrose in 

 the corn, which was 3.87 per cent, wet weight 147 



Certain Relationships between The Flowers and Fruits of the Lemon 



Fig. I. Average monthly production of lemon buds during the year 155 



Ultra-Microscopic Examination of Disperse Colloids Present in Bitu- 

 minous Road Materials 



Fig. I. Glass slide with ultra-microscope cell drawn to natiu^al scale 170 



(IX) 



