Correlation of one lactation record with the milk yield for the first 



five lactations (Bulletin 289) 129 



The Variation of Butter-Fat Percentage with Age in Jersey Cattle 



Summary (Bulletin 290) 132 



Materials and methods (Bulletin 290) : 135 



Variations of fat percentage with the age when test was made 



(Bulletin 290) 136 



Correlation of 8 months' butter-fat per cent with age cf cow 



(Bulletin 290) 142 



The Correlation Between the Butter-Fat Percentage of One Lacta- 

 tion and Succeeding Lactations in Jersej^ Cattle. Summary. 



(Bulletin 291 ) 145 



Correlation of butter-fat per cent for 8 months with like butter-fat 



per cent at any other given age (Bulletin 291) 147 



Correlation between butter-fat per cent cf first five lactations and 

 the mean butter-fat per cent of these individual lactations 



(Bulletin 291) 152 



Potato Mosaic. Summary. (Bulletin 292) 157 



Introduction (Bulletin 292) 158 



Appearance of the diseased plants (Bulletin 292) 160 



Other effects of the disease (Bulletin 292) 161 



Transmission by the tubers (Bulletin 292) 163 



Proofs of infectiousness (Bulletin 292) 164 



Insects as carriers (Bulletin 292) 168 



Other possible factors in the spread of mosaic (Bulletin 292) 175 



Methods of control (Bulletin 292) .180 



Recommendations for the control of potato mosaic (Bulletin 292) 183 

 Studies in Milk Secretion VIII. Influence of Age on Milk and 



Butter-Fat Vield in Hclstein-Friesian Cattle (Bulletin 293) ... 185 

 Normal and abnormal germination of grass-fruits. Summary. 



(Bulletin 294) 197 



Material and Methods (Bulletin 294) 199 



Normal Germination of Grass-Fruits (Bulletin 294) 199 



Abnormal Germination of Grass-Fruits (Bulletin 294) 207 



The Mechanical and Biological Functions of the Coleorhiza 



(Bulletin 294) 213 



Polyemryony in Grasses (Bulletin 294) 214 



Abnormal Germination as a Source of Error in Germination Tests 



( Bulletin 294) 214 



Transmission cf milk yield to the first generation (Bulletin 295) .'. 217 

 Transmission of butter-fat percentage in the first generation 



(Bulletin 295) 219 



Mode of Transmission of milk quantity as shown by first gener- 

 ation (Bulletin 295) 221 



The life cycle of Aphids and Coccids (Bulletin 295) 221 



Transmission of the Mosaic disease of Irish potatoes (Bulletin 295) 223 



Meteorological observations (Bulletin 295) 224 



Report of Treasurer (Bulletin 295) 226 



Index (Bulletin 295) 229 



