68 AGRONOMY [Box. Absts., Vol. VI. 



germinator box serves to keep the dolls in proper position and thoroughly moist. This method 

 of testing seed corn is well suited for community testing. Results of a test on a large scale 

 at Shelby ville, Indiana, in 1920 show an average of 35 per cent of infected seed ears. — G. N . 

 H offer. 



478. Espino, Rafael B. A review of the maize investigations at the College of Agriculture. 

 Philippine Agric. 8: 191-197. 1919. — An epitome of the maize investigation completed by the 

 Philippine College of Agriculture and a bibliography of the same. — C. V. Piper. 



479. Fisher M. L. More study of pastures and pasturing needed. Proc. Soc. Promotion 

 Agric. Sci. 39: 19-21. 1919. — "Inasmuch as pasturage is so important in live stock farming it 

 is rather strange that so little has been done in an experimental way with pastures and pas- 

 turing." To remedy this situation, experiments covering the adaptation of plants to soils, 

 seed bed preparation, single or mixed seedlings, fertilization, carrying capacity of pastures, 

 continuous or alternate grazing, improvement of grass seeds and breeding of better plants are 

 suggested. — Lyman Carrier. 



480. Harris, J. Arthur. Practical universality of field heterogeneity as a factor influenc- 

 ing plot yields. Jour. Agric. Res. 19: 279-314. 1920. — Heterogeneity is the difference in capa- 

 city for crop production, throughout a field of such magnitude as to influence in like manner, 

 but not necessarily in like degree, the yield of adjacent small plots. Experimental data from 

 many published sources are analyzed statistically to determine the extent to which hetero- 

 geneity of experimental fields may influence plot yields. The results of the analysis show 

 that in every field the irregularities of the substratum have been sufficient to influence, often 

 profoundly, the experimental results. — Analysis of data on physical and chemical requisites 

 for plant growth show that the coefficients for water content and for chemical composition of 

 soil are of about the same order as those found for crop yields and "while these results do not 

 prove that the heterogeneity of experimental fields in their capacity for crop production is 

 directly due to these and other physical and chemical factors, there can be little doubt that 

 this is actually the case." Greater care in technic and more extensive use of the statistical 

 method in analysis of plot experimentation are recommended. — D. Reddick. 



481. Hertel, H. Landbruget i 1919. [Agriculture in 1919.] Tidsskr. Landokonomi 

 (Kjobenhavn) 1920 1 : 1-36. 1920. — During the month of May, 1919, various species of insects 

 attacked the small grains. Sandfleas were particularly bad on barley, but since the infesta- 

 tion did not last long the damage was not severe. The green fly larvae did considerable dam- 

 age to oats in late sown fields. Grain lice attacked barley and oats, but rain and cool weather 

 seemed to stop damage from this source. During the year 1919 the fields seemed unusually 

 free of weeds. During August and September cabbage worms and cabbage lice caused con- 

 siderable damage to cabbages and turnips. — Albert A. Hansen. 



482. Hoffer, G. N. Disease-free sweet corn seed. Purdue Univ. Agric. Exp. Sta. Bull. 

 233. 12 p., fig. 1-8. 1920.— See Bot. Absts. 6, Entry 1271. 



483. Maiden, J. H. Chats about the prickly pear. No. 4. Agric. Gaz. New South 

 Wales 31 : 407-412. 1920. — Presents a resume of results in the feeding of Opuntia spp. in Aus- 

 tralia, in the United States and in India. — L. R. Waldron. 



484. McGovern, J. A. Wheat grading for schools. North Dakota Agric. Exp. Sta. Ext. 

 Div. Circ. 36. 8 p. 5 fig. 1920. — An illustrated description of wheat grading for instruction 

 in the public schools, as required by the state law. — C. V. Piper. 



485. McKenzie, R. T. Agriculture in Denmark. Jour. Dept. Agric. Victoria 18: 140- 

 149. 1920. — General conditions described. — J. J. Skinner. 



