1920] CONTENTS. Ill 



Page. 



Recent studios on growth in thickness of troos, Jaccard S19 



Heat production and temperature in living plants, Leiclc 819 



Influence of liglit on fructification of Agaricacejii, Maire and de Laroquette_ 819 



Lengtli of day controls time of flowering and fruiting 819 



An apparent daily automatic periodicity [in plants], Komell 820 



Comparative studies on ri'spiralion, VU-IX 820 



Phytochcniical investigations on plants, I, Donunguez et al 820 



Review of the genus Arreuthohiuni (Razoumofskya), von Tubeuf 821 



Permeability in plant cells, Weber 821 



Quantitative laws in regeneration, I, Loeb 821 



Influence of gravity on arrangement of organs in regeneration, Loeb 821 



Resistance of intracellular organisms to chemical substances, Galippe 822 



Influence of organic substances on plants, III, Ciamician and Ravenna 822 



A device for regulating the temperature of incubatoi's, Northrop 822 



FIELD CROPS. 



The unreliability of short-time experiments, Harris and Butt 822 



[Report of field crops work, at Grand Rapids, Minn., Substation], Bergh 822 



[Report of field crops work in Kentucky, 1919] 824 



[Field crops work in Western Australia], Sutton et al 824 



Influence of spring and fall grazing on yields of grasslands, Tennesson— S24 



The shrinkage of market hay, McClure 825 



Abaca (Manila hemp) : The liber monopoly of the Philippine Islands, Lee_ 826 



Daily development of kernels of Hannchen barley, Harlan 826 



Development of barley in normal and clipped spikes, Harlan and Anthony- 826 



Castor oil as a crop, Mathieu 827 



Freezing injury of seed corn, Kiesselbach and Ratcliff 827 



Cotton culture in the Belgian Kongo. Mees 828 



Cotton in British West Africa, Penzer 828 



Native tiber plants, Sellergren 828 



Fibers from India, Africa, and the West Indies 828 



The Kawai, Knowles and Knight ■ 829 



Experiments in growing peas, Vik 829 



The technique of cross-fertilization in potatoes, Salaman 829 



Potato culture, Werner, revised by von Eckenbrecher 829 



Potato storage and storage houses, Schneider 829 



Notice of public hearings [on] proposed standards for milled rice, Houston- 830 



Soy bean 830 



Acreage census of cane varieties for the crops of 1919, 1920, 1921, Agee 830 



Cane pro<luction and sugar manufacture in the Philippine Islands, Hines_ 830- 



Notes on sweet tus.sock (Phalaris bulbosa), Bovet 830 



Tobacco investigations. Chapman 830 



Selection experiments with Deli tobacco, IV, Honing 831 



Velvet beans 831 



Hairy vetch seed production in the United States, Kephart and McKee 831 



Experiments with Indian wheat in INIesopotamia, 1917-18, Garbett 831 



Wheat varieties of the Ahaggar District, Sahara, Ducellier 831 



Wheat grade announcement, Meredith 832 



Longevity of the seeds of cereals, clovers, and timothy, Sifton 832 



The Dani.sh State seed testing station 832 



Cocklebur, Hansen 832 



Dodder in Idaho, Sheehan 833 



IIORTICUXTUKE. 



Practical amateur gardening, Thomas 833 



I Horticultural work at North Central Minnesota Substation], Bergh 833 



Report of the horticulturist, Turney 833 



Report of the horticulturist, Shaw 833 



[Report on horticultural investigations in 1919], Allan 833 



A general view of the Netherlands. — II, Nurseries 834 



Use of dry lime sulphur in sprays 834 



V!i(} of insecticides and fungicides in South Africa, Pisar 834 



The profitable culture of vegetables. Smith 834 



Observations on the root development of vegetable plants, Kroemer 834 



Ripening in the tomato, from the commercial standpoint, Sando 834 



I 



