CONTENTS 
Puant PuyaioLoey: a o Paer 
The Department of Plant Physiology. B. EB. Livinaston...., pices lg: Sumechigtawa Siete 183 
Publications from the Laboratory of. Plant ‘Physiology, 1909-1917...-..00205- 154 
Atmometrie Units. B, E. Livineston i : _ 160 
The Vapor Tension Deficit as an index: of the Moisture Condition of the ‘Air, 
B. E. Lavineston........+ ied hb iahavertchacina lade cmmnvereees au ippauadenoxeyodavovaeus rons 170 
Incipient Drying and Temporary and Permanent Wilting of Plants, as 
Related to External and Internal Conditions. B. E. LAVINGSTON....+.-- 176 
The Effect of Deficient Soil Oxygen on’ the Roots of Higher . Plants. B. E. 
Livineston and E. E. FRee....... eidsice Se Ora Aiwa tectine wenaine ewes 182 
The Experimental Determination of a Dynamic Soil-Moisture Minimum. cao 
BE. PULLING 21... eee ee eee cede appa 9 a veveera see. eine vaneiatesessis uatavenapoansenseedt etie 186 
Some Unusual Features of a Sub-Arctie Soil. H. E. PULUING......+-..0055 188 
The Geographical Distribution of tlie Citrus Diseases, Melanose and Stem-end 
Rot. H. S. Fawcnrr......--..--- ere aistiow ategeey ja eoeier Syete tia wnleeetaleN 190 
Préliminary Note on the Relation of ‘Temperature to the Growth of Certain 
Parasitic Fungi in. Cultutes. . H., S.. Fawcerr. ney eae gies va eeeweee . . 198 
Symptoms of “Poisoning by Certain, Elements, in Pelargonium and Other 
Plants, ‘E E. FREE...... testee me Quedeeesakous agian Dinars Aicwiat eva ea apa: ac aneeb eben 195 
‘The Effect of ‘Aeration on the Growth of Buckwheat in Water-Cultures. E. E 
FRSE cu rans eewens se soe pivigis’s tinysiwaatate ie areata s tena ceeene tances : 198 
The Effects of Certain Mineral Poisons on ‘Young Wheat Plants in Three-Salt 
Nutrieiit Solutions. E. E. Free and S. F. TRELBASE............5+0055 199 
Leaf-Productas an Index of Growth in Soy-Bean. F. M. Hivpesranpr...... 202 
A Method,for Approximating. Sunshine Intensity trom cas Observations of 
Cloudiness. F, M. HILDERBANDT.......... ie wiscaen ceo iat veds x ebiniaindesgp ap ssn 205 
Moisture Equilibrium in Pots’ of Soil Equipped with Auto- Teche sienis FS. 
HouMEs | atehanats <a. Se cere 6 giegeen es oan hives: dames Cie VES 208 
“Seasonal Variations in “the Growth- Rates of Buckwheat Plants under Green- 
house Conditions.’ E. 8. JOHNSTON....... 60... cree eee ee eee ee nee 211 
On the Relation of Chlorine to Plant Growth. W. E, Torzmenam.......... 217 
A.Study of Salt Proportions in 2 Nutrient Solution conaining Chloride, as 
Related to the Growth of Young Wheat Plants, Ss. F. TRELEASE........ 222 
The Relation of the Concentration, of the Nutrient Solution to the Growth of 
Young Wheat Plants in Water Cultures. Ss. F. TRELEASE ier ane ewe 225 
The Effect of Renéwal of Culture Solutions on the Growth of Young Wheat 
Plants in Water-Gultures. §, F. TREvease and E. E. Faie............ 227. 
