CONTENTS. Ill 



Page. 



Production and extraction of guano, Coker 525 



Utilization of wrack, Swalni 525 



City household garbage. Danger 525 



Utilization of household wastes, Bocher 525 



Apparatus for utilizing dead animals and slaughterhouse refuse, Frankel et al. . 525 



AGRICULTURAL BOTANY. 



The physiology of stomata, Lloyd 525 



Influence of mixture of soluble salts on leaf structure and transpiration, Harter. . 527 



The value of sodium to plants by reason of its protective action, Osterhout 527 



The protective effect of sodium on plants, Osterhout 527 



Notes on hydrocyanic acid in some plants, De Jong 527 



A study of yeasts from California grapes, Holm 528 



[Report of the] department of botany, Bolley 528 



Seeds and plants imported from July, 1906, to December 31, 1907 528 



A catalogue of the poisonous plants of Iowa, Pammel and Fogel 528 



FIELD CROPS. 



Field experiments, 1907 529 



Fertilizers for Jerusalem artichokes, Donon 529 



Tests with different strains of root crops, Helweg 529 



Variety tests and storage experiments with beets, Sjollema and Van Daalen. 530 



Storage experiments with fodder beets, 1904-1907 530 



Is it advisable to remove leaves of mother beets when placing in silo? Briem. . 530 



Dry matter and sugar content of beet and importance in breeding, Plahn. . . 530 



Studies on seed formation in clover and alfalfa, Bolley 530 



Distance between hills for corn in Illinois corn belt, Hume, et al 531 



Ten generations of corn breeding. Smith 531 



Corn: Selection, storing, curing, and testing for seed, Jeffery 532 



Testing the germination of seed corn, Jones 532 



The culture of cotton without irrigation, Pretrel 533 



The flax stem, Tammes 533 



Trials of hemp, Bolley 533 



Hop culture and handling, Fruwirth 533 



A study of the factors influencing the improvement of the potato, East 533 



Irish seed potatoes in England, 1907 535, 



Solanum commersonii violet and the Blue Giant, Pethybridge 535 



Dwarf Essex rape for winter forage, Scott 535 



Ten years' trials with different varieties of rye, Mortensen and Hansen 536 



The fertilizing value of hairy vetch for Connecticut tobacco fields, Robinson. . 536 



[Comparative and chemical studies of wheat varieties], Scherffius and Woosley . . 536 



Some new hybrid wheats, Elliott and Lawrence 537 



HORTICULTURE. 



A further study of soil treatment in greenhouse culture, Wheeler and Adams. . 537 



The French garden, McKay 538 



Orchard cover crops, Thornber 538 



Fruit marketing investigations in 1907, Higgins 538 



Cape fresh fruit export trade, season 1908, Chiappini 539 



Peach, apricot, and prune kernels as by-products of the fruit industry, Rabak. . 539 



Commercial fertilizer experiments with coffee, Helmrich 539 



The future of cacao planting. Smith 540 



Street trees, their care and preservation, Taylor 540 



The small country place, Maynard 540 



The preservation of cut flowers, Ducomet and Fourton 540 



Exploitation of medicinal plants 540 



FORESTRY. 



Neudamm forestry manual, Schwappach et al 541 



Forest survey methods, Ross 541 



Handbook on forest mensuration of the white pine in Massachusetts, Cook .... 541 



Fertilizer experiments with pine on high moorland. Von Tubeuf 541 



Eucalyptus in California, Ingham , , 542 



