VoliXXVH 
FEBRUARY 16* 1924 
No. 7 
JOURNAL OP 
CONTENTS 
Experiments with Flag Smut of Wheat and the Causal^Fungus, 
Urocystis tritici Kcke. - - - - ' - - 
MARION A. GRIFFITHS 
. (Contribution from Bureau ol Plant Industry) - 
Page 
425 
Studies on the Parasitism of Urocystis tritici Koerh., the Organ¬ 
ism Causing Flag Smut of Wheat - - - - - 451 
ROBERT J. NOBLE 
(Contribution from Bureau ol Plant Industry) 
Inheritance of Petal Spot in Pima Cotton - - - - 491 
THOMAS H. KEARNEY 
(Contribution from Bureau of Plant Industry) 
The Migration of the Aphididae and the Appearance of the 
Sexual Forms as Affected fcy the Relative Length of Daily 
Light Exposure - - - - - - - - - 
S.MARCOVrrCH 
(Contribution from Tennes^e Agricultural Experiment Station) 
513 
PUBLISHED BIT AUTHORITY OF THE SECRETARY OF AGRICULTURE 
WITH THE COOPERATION OF THE ASSOCIATION 
- OF LAND-GRANT COLLEGES 
WASHINGTON, JVC. 
. GOVERNMENT PRINTING OFFICE 
