﻿10 DEPARTMENT OF AGRICULTURE BULS. 1376-1400 



Page 

 Department Bulletin No. 1396. — A Comparison op Maize-Breeding 

 Methods: 



Introduction 1 



Description of the experiments 2 



Preliminary comparisons 3 



Abnormalities in Sacaton June corn 4 



Parent-oflf spring correlations in the self ed experiment 4 



Plants from high-jdelding rows compared with high-yielding plants 



selected without regard to the progeny performance 5 



Yield comparisons of the two breeding methods in 1923 6" 



Yield comparisons of the two breeding methods in 1924 7 



Correlation of number of plants with jdeld per plant 11 



Measures of inbreeding 11 



Discussion 14 



Mutations 14 



Segregation of simple Mendelian characters 14 



Segregation of multiple-factor characters 16 



Conclusions 18 



Summary 20 



Literature cited 21 



Department Bulletin No. 1397. — The Pink Bollworm, with Special 

 Reference to Steps Taken by the Department op Agriculture 

 TO Prevent its Establishment in the United States: 



Historical 1 



Original home 2 



Present range 3 



Present distribution in Mexico 4 



Description and life history 5 



Natural enemies 12 



Nature and extent of damage 12 



Damage in Mexico 14 



Precautions taken to prevent the introduction of the pink bollworm 



into the United States 16 



Discovery in Mexico 19 



Discovery in Texas 20 



Organization of the preventive work of the Department of Agri- 

 culture 22 



Chronological summary of infestations 23 



Scouting outside of known infested districts 25 



Present status 27 



Literature cited 29 



Department Bulletin No. 1398. — Comparative Efficiency op Wire- 

 Basket Bunkers in Refrigerator Cars: 



The car-cooling problem 1 



Installation of wire-basket bunkers 2 



Results of test trips . 2 



Temperatures maintained , 4 



Comparative study of temperatures 9 



Summary 10 



Department Bulletin No. 1399. — -Agricultural Survey op Europe: 

 Germany: 



Agricultural surveys of foreign countries ii 



A survey of German agriculture 1 



Wheat 32 



Rye__ 40 



Spelt 46 



Barley 47 



Oats 50 



Potato 53 



Sugar beet and sugar 58 



Fodder beet 66 



Hay__ 67 



Livestock industry 69 



Horses 82 



Cattle 86 



