4G Bureau of Fakmeijs' Institutes. 



of gaining fiome information on this subject investigations were 

 begun which, in 1899, included tests in fertilizing 12 nearly or 

 quite self-sterile kinds with pollen of various varieties, some of 

 which were self-sterile. 



Methods of Making Tests. 



All clusters were covered with bags before the blossoms 

 opened, to keep away the insects, which might otherwise visit 

 the flowers and bring with them the pollen of other varieties. 

 This was done with the clusters which were to receive the pollen 

 and with thoee which were to furnish the pollen also. When 

 the clusters were in bloom the bags were opened and the blos- 

 soms brushed with clusters taken from the variety which had 

 been chosen to furnish the pollen for that particular test. The 

 bag was then immediately closed and properly labeled. It was 

 left undisturbed till after the vines had gone out of bloom, after 

 which the results of the tests were recorded. When the fruit 

 was ripe it was gathered and each cluster rated on the 

 scale of 100, to show how well filled it was with fruit, 100 repre- 

 senting a perfectly formed cluster. 



Some of the results are summarized briefly in the following 

 paragraphs: 



Aminia is practically self-sterile. When it was used to pol- 

 linate Brighton the clusters averaged 0.3 on a scale of 100 for a 

 perfect cluster. When used to pollinate Wyoming the average 

 rating was 2. This indicates that Aminia is practically worth- 

 less as a fertilizer for self-sterile sorts. When Brighton and 

 Wyoming were pollinated with strongly self-fertile kinds like 

 Catawba and Niagara, good clusters of fruit were produced. 

 Black Eagle, as far as tested, has proved self-sterile. It was used 

 to pollinate the self-sterile Barry and the practically self-sterile 

 Eumelan, but no fruit resulted. Brighton is practically self- 

 sterile, but occasionally it produces a few fruits when self-pollin- 

 ated. (See Plate II.) It was used to pollinate the follow- 

 ing varieties which are self-sterile, or nearly so (the average 



