INDEX 



Page 



Acid, a-crotonic, occurrence in soils 1043-1046 



Aeration, effect of, on nitrogen-fixing power 



of soil containing arsenic 408 



Agricultural Value of Impermeable Seeds 



(paper) 761-796 



Aleurocanthus — 



citricolus, description of 459 



citriperdus, description of 459-463 



spiniferus, description of 465 



woglumi, description of 463-465 



A leurodes — 

 citricola, syn. Aleurocanthus citricolus. 

 engeniae, var. auranlii, syn. Dialeurodes 



citri. 

 floccosa, syn. Aleurothrixus floctosus. 

 floridensis, syn. Trialeurodes floridensis. 

 horridus, syn. Aleurothrixus floccosus. 

 marlatli, syn. Aleurolobus tnarlatti. 

 mori, syn. Telraleurodes mori and T. mori 



arizonensis. 

 perseae, syn. Paraleyrodes perseae. 

 spinifera, syn. Aleurocanthus spiniferus. 

 Aleurolobus marlatti — 



description of 466 



parasite of — 



Citrus sp 466 



Morus sp 466 



Aleurothrixus — 

 floccosus — 



description of 466 



parasite of — 



Baccharis genislelloides 466 



Citrus spp 466 



Guaiacum officinale - - 466 



Plumeria sp 466 



Psidium guajava 466 



howardi, description of 466 



porteri, description of 466-468 



Aleyrodes — 

 auranlii, syn. Dialeurodes citri. 

 citri, syn. Dialeurodes citri. 

 cilrifolii, syn. Dialeurodes citrifolii. 

 giffardi, syn. Bemisia giffardi. 

 howardi, syn. Aleurothrixus howardi. 

 mori arizonensis, syn. Telraleurodes mori ari- 

 zonensis 

 nubifera, syn. Dialeurodes citrifolii. 

 litrinellus, syn. Trialeurodes vitrinellus. 

 Alfalfa. See Medicago saliva. 



Algae in soil, effect of carbon bisulphid on 4 



Aleyrodidae, or White Flies Attacking the 

 Orange, with Descriptions. of Three New 

 Species of Economic Importance (paper) . . 459-47-1 

 Allard, H. A. (paper) Some Properties of the 



Virus of the Mosaic Disease of Tobacco. . . 649-674 

 Alocasia sp. — 

 host plant of— 



Diplodia gossypina 555 



Diplodia tubericola 550-551 



Fusarium sp 555 



55854°— 16 3 



Page 

 Alocasia sp. — Continued 

 inoculation with — 



Diplodia maclurae 555 



Diplodia tubericola 555 



Alway, F. J., and Russel, J. C. (paper) Use 

 of the Moisture Equivalent for the Indirect • 

 Determination of the Hygroscopic Coeffi- 

 cient 833-846 



Ammonia, formation of, in experimental plots. 961 

 Anasa Iritis, agent in spread of bacterial wilt . . 419 

 Andropogon sorghum — 

 comparative study of root systems and leaf 



areas of 311-332 



comparative weight of roots and aerial parts 



of 322-324 



determination of leaf and sheath areas 



of 318,326-329 



experimental methods used in studying root 



system of 311-318 



extent of root system of 318-320 



secondary root system of 321 



soil-moisture content and depth of root 



penetration of 324-325 



Annona squamosa, host plant of Trialeurodes 



floridensis 47° 



Apanteles militaris — 



life cycle of 456-457 



parasite of Cirpkis unipuncta 455-458 



Aphidoletes meridionalis, an Important Dip- 

 terous Enemy of Aphids (paper) 883-888 



Aphidoletes meridionalis — 



aphids attacked by 884 



description of 885-887 



economic importance of 883 



life history of 885-887 



natural checks of 884 



parasite of — 



Aphis spp 884 



Chaitophorus negund'/tis 884 



Hyalopterous pruni 884 



Macrosiphum spp 884 



Myzus persicae 884 



Phorodon humuli 884 



Rhopalosiphum sonchi 884 



Siphiflava 884 



Siphocoryne pastinacae 884 



Toxoptera graminum 884 



Aphids, dipterous enemy of 883-888 



Aphis— 

 asclepiadis, hostot Aphidoletes meridionalis. . 884 



avenae, host of Aphidoletes meridionalis 884 



cardui, host of Aphidoletes meridionalis 884 



gossypii — 



agent in the spread of bacterial wilt 419 



host of Aphidoletes meridionalis 884 



helianthi, host of Aphidoletes meridionalis . . . 884 



maidis, host of Aphidoletes meridionalis 884 



setariae, host of A phidoletes meridionalis .... 884 



woolly pear 351-360 



Apple — 

 See Malus syhestris. 

 crab. See Malus spp. 



1047 



