48 BuKEAu OF Fakmeks' Institutes. 



its polk'u was tried, because the clusters were not always in full 

 bloom when pollinating was done. Nevertheless, in a general 

 way, the results may be taken as signifying that self-sterile sorts 

 are practically worthless as fertilizers for other self-sterile varie- 

 ties, and that it is best to select as fertilizers f.)r s If sterile grapes 

 strongly self-fertile kinds which bloom at the right season. For 

 a more complete account of these investigations consult Bulletin 

 169 of the State Experiment Station, Geneva, N. Y. 



