720 EXPERIMENT STATION fiECOBD. [VoJ. S7 



gave 3J times the number and 7i times the weight; 13 parts per miUioD from 

 the phosphotungstic fraction gave li times the uumber and 2} times the weight 



" The eifeot of tlie reduction in amount of auximones with successive frac- 

 tionation of the bacterized peat was also manifest from the general appear- 

 ance of the plants. Those in mineral nutrients only decreased in size week 

 by week, and became very unhealthy in appearance, while there was a pro- 

 gressive improvement in the appoiirance of the plants supplied with increasing 

 amoxints of auximones. Those receiving the larger amounts retained their 

 normal healthy appearance throughout the experiment and increased in sire. 



" The beneficial effect of the auximones was not due to a neutralization of the 

 toxic substances present in the ordinary distilled water, since comparable re- 

 sults were obtaineii with conductivity water. An interchange of culture solu- 

 tions, with and without auximones. showed that the plants are very sensitive 

 to the presence or absence of these substances. It is suggested that some of 

 these growth-promoting substanc^es may act dire^'tly as organic nutrients, 

 and others may be of tlie nature of accessory food substances." 



Du Page County soils, C. G. Hopkins. J. G. Mosies. E. Van Alstine. and 

 F. W. Garkett (Illinois Sta. Soil Rpt. 16 (1917), pp. 56, pi. 1, figs. 8V— Du Page 

 County is located in northeastern Illinois within the late Wisconsin glacla- 

 tion. The topography varies from rolling to slightly undulating. The natural 

 drainage is said to be poorly developed. 



The soils of the countj- are divided into upland prairie soils, rich in organic 

 matter, upland timber soils, terrace soils, late s\>-amp and bottom-land soils, and 

 miscellaneous tji>es. Of these the brown silt loam upland prairie soil covers 

 ,">0.9r) per cent, the yellow-gray silt loam upland timber soil, 20.65 p>er cent and 

 the black miieil loam bottom-land soil. TJ.Ol per cent of the area. 



It is pointed out that the soils of the county vary widely in content of 

 fertility constituents. " The deep i>eat contains in the plowed soil of an acre 

 18 times as much nitrogen as yellow silt loam, and about 5 times as much 

 nitrogen, but only one-eighth as much potassium as brown silt loam. The 

 total supply of phosphorus in the surface soil varies from 760 lbs. per acre 

 In the yellow silt loam to 2.360 lbs. in the black clay loam. The amounts of 

 magnesium and calciimi vary from about 4.1H.K> to 5.000 lbs. in some tj"ix»s to 

 more than 20.000 lbs. In others. Some types contain an abundance of lime- 

 stone: others are practically neutral or slightly acid: and still others, such 

 as the yellow-gray silt loam and the brown sandy loam, are acid in the surface 

 and more strongly acid in the subsurf.ice. but sometimes contain an abundance 

 of limestone in the subsoil. More than 00 per cent of the soils of the c 'unty 

 rt^ntaln no limestone In the surface or subsurface to a depth of 20 In." 



Soil survey of Dickey County, N. Dak., T. M. Bishxeij, E. H. Smiks. W. I. 

 Watkins. .V. C. Ani>kkson, M. Thomas, M. E. Stebbins, R. C. Doneghite, and 

 J. W. In»e (Sorth Dakota Sta. Bui. 121 (1917). pp. 5-66, pis. S. fiff. 1. map 1).— 

 This survey has been previously noted (E. S. R.. 36. p. 4211. 



Sand devastation, P. Coi.ijns (i?ri. Atnrr. Sup.. S-'^ {1917), So. tl57, pp. SSO- 

 ^SS. fiffs. 7?>.— Information on how sand dunes ailvamv and how their move 

 ment is oheckeil Is given. 



The improvement of the poor soils and run-down soils of New Jersey, 

 ,T. B. R. Picket (.Y. J. Apr. CoJ. Ext. liul. 1 {1917), Xo. 11. pp. St. figs, t).— 

 This Is a brief general statement of methixls of Improving and maintaining 

 soil fertility, with special reference to the poor and run-<1own soils of New 

 .Tersev. 



Manure and artificial fertilizers for pent soil poor in nitrogen, H. von 

 Feimtzkn (S\'en.<ka Moxskuliurfor. 7ii/v/.r.. .iO {1\U6). .Yo. 5-6. pp. \09-^^6. 

 figs. 7>. — Eleven years" experiments with manure and artificial fertilizei"s mi 



