91 



r.T'i.Lirrix .\<.. r.n i station i. .irxE. i8s<t. 



TiiK (;i;.\i\ I'l.AXT-LousE, A. J. Cook, M. S. (pp. 3-6). — An account 

 of the grain plant-louse (SJphonophora arcvr), the reasons for its 

 boino- numerous this year. etc. The Station is now making '"exten- 

 sive and accurate experiments" regarding the ad\isal)ility of using 

 the kerosene and soap mixture as a remedy. 



3IlNNESOrA. 



Agricultural Experiment Station of the University of Minnesota. 



L)<iiiiil niciit of the l' Hirers if i/ of Miiiiicxold. 

 Locnlinii. S.iint AntlKniy \':\vk. J tircctor, ICdwanl D. Porter, Pli. D.* 



RULLETIX No. .1, .lANUARY, 1S89. 



IxTKODi CTiox, E. D. Porter, Ph. D. (j). 4). — Tlie Station invites 

 co-ojx'ration and suggestions as to lines of work, and will gladly re- 

 ceive specimens of grains, grasses, seeds, vegetables, insects, mineral 

 Avaters. ores, etc., for examination. 



('(IRX, ITS HABITS OF ROOT GROWTH, METHODS OF PLANTIXG AXD CUL- 

 TH ATIXO, XOTES OX EARS AXD STOOLS OR SUCKERS, W. M. HaYS, B. S. A. 



(p\). .■^•-83). — This contains an account of observations and experi- 

 ments made at the Station in 1888, combined with others made at 

 loAva Agricultural College, Ames, Iowa, in 1880, in De Kalb County, 

 Illinois, in 1887, and elsewhere. 



lliih'ifs of roof (/roirfli f ( pj:). .'')-l(')). — The prime object was to as- 

 certain where in the soil the corn does its feeding. The corn experi- 

 inente(l on in 1888 Avas grown in a rich sandy soil, composed of clay 

 and loam, underlaid at a depth of al)<)ut 4 feet with gravel, through 

 Avhich the roots could not penetrate. ( )n one field some grains of corn 

 were planted several feet apart near a Avater main, so that the roots 

 might be Avashed out Avith a jet of Avater under pressure. Numerous 

 corn i-oots Avere dng and examined at ditierent stages of gi'OAvth. 

 The text is illustrated l)y diagrams showing the ])riniarv roots at the 

 first liai'i'owing; at the first, second, third, and fourth eultivating 

 and late in the fall: root pruning 1)V deej) and shalloAV cultivation; 

 the root hairs and " sucking cells; "" the roots and stem just prcA'ious 

 to tasseling; roots and lower part of a mature stall: in a di'V year, etc. 

 It is clearly shoAvn tliat in the spring. Avhen the surface soil is com- 

 ])aratively warm, moist, and rich in plant food, the roots of the lower 

 Avhorls start out nearly horizontally and spread in this direction from 

 •2 to .5 feet from the stalk, but as the u])i)er soil groAvs diy they turn 

 doAvnwanl. jiltaining a length of fi-oni 3 to 8 feet or eA^en more. The 



* Professor Porter resi.micd Alaidi 'Jl. ISS!), and Prof. N. AA'. :\fcLain. LL. B., 

 was elected in his stead. 



t 8ee observations on tlie rcmts <if cnni and dtlu'i- plants liy 'i'liicl. Xatlnisins, 

 AA'.-mdtafcln : lA' Scrie. P.t'wnrzelnnir : Tiiii'l. Uciiiii, I'aii'V 



