158 AGRONOMY [Bot. Absts., Vol. V, 



1152. Helweg, L. Sale of Danish root seed with guarantee for genuineness. Seed World 

 7 3 : 24-26. 1920. — This article deals with the Danish methods of growing seeds of carrots, 

 mangels, rutabagas, and turnips and the guaranteeing of the genuineness of the varieties and 

 strains, a method now adopted by nine of the important seed dealers. — M. T. Munn. 



1153. Hilgendorf, F. W. Methods of plant breeding. New Zealand Jour. Agric. 19: 

 354-358. 1919. — The work of several investigators is briefly reviewed and the conclusion 

 drawn that simple selection for the improvement of self fertilized plants, such as wheat, is 

 not considered as very hopeful. — N. J. Giddings. 



1154. Hillman, F. H. Rhode Island bent seed and its substitutes in the trade. Proc. 

 Assoc. Official Seed Analysts 1919:64-68. 1919. — In this paper the author reports recent 

 investigations which show that there are certain seed characteristics peculiar to each of the 

 species, by means of which the kinds of seed may be distinguished and to a certain extent their 

 true proportions in a mixture determined. The source of the seed, shown or indicated by the 

 kinds of weed seeds and extraneous crop seeds present, is also an aid in determining the kind 

 of seed and liability of mixture due to condition of growth and trade practice. Attention iB 

 directed by the author to detailed and illustrative descriptions of the seeds of bent grasses 

 found in Bulletin 692, Professional Series, U. S. Department of Agriculture. — M. T. Munn. 



1155. Hite, Bertha C. Forcing the germination of bluegrass. Proc. Assoc. Official Seed 

 Analysts 1919: 53-58. 1919. — Experiments designed to ascertain the effect of light, tempera- 

 ture, and nutrient solutions on the germination of Kentucky bluegrass and Canada bluegrass 

 are discussed. The experiments lead to the conclusions that: A complete viability test of 

 Kentucky blue grass can be obtained in the dark with an exact 20°-30°C. alternation, lender 

 constant temperature conditions this grass gives a higher germination in the light. — An alter- 

 nation of 20°-30°C. in a dark chamber does not give a complete viability test of Canada blue- 

 grass. — Direct sunlight or diffuse light a few hours each day with approximately a20°-30°C. 

 alternation gives a complete viability test of both Canada blue grass and Kentucky bluegrass. 

 — Nutrient solutions with 20°-30°C. alternation in the dark give a complete viability test of 

 both Kentucky bluegrass and Canada bluegrass. — So far we have not been able to find an alter- 

 nation of temperature alone that would give a complete viability test of all samples of Canada 

 bluegrass. — M. T. Munn. 



1156. Hodson, Edgar A. Upland long staple cotton in Arkansas. Arkansas Agric. Exp. 

 Sta. Circ. 49: 1-4. 1920. — The conditions under which upland long staple cotton varieties 

 may be expected to produce a profitable crop are given together with a map showing the 

 regions suited to the culture of long staple, intermediate, and short staple cottons. — John A . 

 Elliott. 



1157. Hodson, Edgar A. Cotton Club manual. Arkansas Agric. Exp. Circ. 84: 1-26. 

 // fig. 1920. — A popular manual covering the history, physiology, histology, culture, and! 

 use of the cotton plant. — John A. Elliott. 



1158. Hodson, Edgar A. Lint frequency in cotton with a method for determination. 

 Arkansas Agric. Exp. Sta. Bull. 168: 1-12. 1920. — Lint frequency was determined for 100 

 seed samples from 10 plants each of 25 varieties of cotton under test. The length of lint was 

 determined, also the percentage of lint by weight. The seed was delinted with sulphuric aciil 

 and the volume determined by displacement in alcohol. The weight of lint of a uniform length 

 of 25 mm. was calculated to give an accurate comparison of weight of lint produced per squaio 

 centimeter of seed surface. The lint index for a plant represents the average amount of lint 

 produced on one seed. Six tables are given showing the lint index, lint percentage, lint length, 

 and lint frequency of the varieties studied. — "High lint frequency is closely correlated with 

 short lint, therefore, it is necessary in making selections for high lint frequency to consider 

 length and per cent of lint." — John A. Elliott. 



