32 BULLETINS OF THE BUREAU OF PLANT INDUSTRY. 



* No. 78. Improving the Quality of Wlieat. By T. L. Lyon, Agri- 

 culturist and Associate Director of the Agricultural 

 Experiment Station of Nebraska, and Collaborator of 

 the Bureau of Plant Industry. 1905. 120 pp. Price, 

 10 cents. 



Contents : Objee-t of the investigation. Part I. Historical : Some con- 

 ditions affecting- the composition and yield of wheat: Composition as affected 

 by time of cutting; infinence of immatnre seed npon yield; influence of 

 climate upon composition and yield ; influence of soil upon composition and 

 yield ; influence of soil moisture upon composition and yield ; influence of 

 size or weight of the seed-wheat kernel upon the crop yield ; relation of size 

 of kernel to nitrogen content ; influence of the specific gravity of the seed 

 kernel upon yield ; relation of specific gravity of kernel to nitrogen content ; 

 conditions affecting the production of nitrogen in the grain. Part 11. Experi- 

 mental : Some p»roperties of the wheat kernel — Yield of nitrogen ]3er acre — 

 Method for selection to increase the quantitj^ of proteids in the kernel — 

 A basis for selection -to increase the quantity of proteids in the endosperm 

 of the kernel — Improvement in the quality of the gluten — Some results of 

 breeding to increase the content of proteid nitrogen — Y'ield of grain as affected 

 by susceptibility to cold — Yield and nitrogen content of grain as r '^ected by 

 length of growing jieriod — Pelation of size of head to ^'leld. liL-ight. and tiller- 

 ing of plant — Summary and conclusions. 



No. 79. The Variability of Wheat Varieties in Resistance to Toxic 



Salts. By L. L. Harter, Scientific Assistant, Laboratory 



of Plant Breeding. 1905. 48 pp. Price, 5 cents. 



Contents : Introduction — Salts used — Varieties selectetl : Preston ; Turkey ; 

 Zimmerman; Kharkof ; Padui ; Chul ; Budapest; Kubanka ; JNIaraouani — 

 ^Methods of experiments — Method of establishing the toxic limits — Results of 

 cxj:)eriments : With magnesiimi sulphate ; with magnesium chlorid ; with 

 sodium carbonate ; with sodium bicarbonate ; with sodium sidphate ; with 

 sodium chlorid; summary of tables — Comparison of results with different 

 sjDecies — Ash analyses — Individual variability — Neutralizing effect of the salts 

 employed upon otlier toxic substances — Dilute solutions as stimulants — Practi- 

 cal value of results — Summary — Bibliography. 



No. 80. Agricultural Explorations in Algeria. By Thomas LI. Kear- 

 ney. Physiologist, Vegetable Pathological and Physiolog- 

 ical Investigations, Bureau of Plant Industry, and Thomas 

 H, Means, Formerly of the Bureau of Soils. 1905. 98 

 pp., 4 pis. Price, 10 cents. 



Contents : Introduction — Topography : Coast region ; high plateau or 

 steppe region ; desert region — Climate : Coast region ; temperature ; humid- 

 ity ; precipitation ; wind ; high plateau region ; desert region ; temperature ; 

 humidity ; precipitation — Irrigation : Coast region ; high plateau region ; desert 

 region— Soils : Coast region; littoral zone; valley and plain zone; moun- 

 tain zone; high plateau region; desert region; saline soils; coast region; 

 desert region ; soil management ; rotations ; fertilizers ; preparation of the 

 land; clearing and leveling; plowing — General economic conditions: Histor- 

 ical and political ; land values ; farm labor ; agriculture of the native popula- 

 tion ; among the Arabs ; among the Kabyles ; among the Saharans — Crops of 

 the colony : Geographical distribution ; coast region ; littoral zone ; valley 

 and plain zone ; mountain zone ; high plateau region ; desert region ; ]irinci- 

 pal crops in detail ; fruit crops ; grapes ; wine grapes ; table grajies ; olives ; 

 figs; citrus fruits; dates; less important orchard crops; truck crops; 

 cereals; winter cereals; wheat; barley; oats; summer cereals; sorghum; 

 Indian corn ; forage crops ; wild forage ; fallow-land forage ; forage of 

 natural meadows and prairies ; cultivated forage ; leguminous crops ; alfalfa, 

 or lucern ; horse beans ; sulla ; fenugreek ; berseem ; vetches ; tree crops 



101 



