XII CIRCULARS OF THE BUREAU OF PLANT INDUSTRY. 
rage. 
Circulai: No. ■'>«. — The Bud-Rot of the Coconut Palm. 
Prevalence of bud-rot in tropical America 3 
Comparison of bud-rot with various coconut diseases 3 
Desirability of a comparison of diseased material from the eastern and 
western tropics 4 
Necessity for further knowledge of the disease 4 
Cieculae No. 37. — Comparative Tests of Sugar-Beet Varieties. 
Introduction 3 
Importance of comparative tests of sugar-beet varieties 3 
Methods of conducting the tests 4 
Methods of seeming the seed used 5 
Varieties of seed used and growers producing them 5 
Results of the tests 6 
Circular No. 38. — European Currant Rust on the White Pixe in America. 
Introduction 1 
Life history of the fungus 2 
Field characters of the disease 3 
Damage caused by the rust 3 
Methods of combating the rust 3 
Caution 4 
Circular No. 39. — The Decay of Cabbage in Storage: Its Cause and 
Prevention. 
Introduction :'. 
Factors contributing to decay 4 
Field infections 4 
House infection 4 
Careless handling 5 
Organisms concerned in decay 5 
Black-rot ■"> 
Soft-rot 6 
Leaf-blight 6 
Storage conditions necessary for preventing decay 6' 
Construction of storage houses to prevent decay 7 
Methods of storing cabbage 8 
Conclusions 8 
Circular No. 40. — A Simple Method of Detecting Sulphured Babley 
and Oats. 
Introduction '■'< 
Method of bleaching used 3 
The chemicals necessary for detecting sulphured grain 4 
Method of testing grain 5 
Necessity for cleanliness 6 
Tests of natural barley in comparison with sulphured barley 7 
