512 Report of the Department ok Horticulture of the 



No attempt is made to compare the behavior of varieties and 

 stocks in the two vineyards on slightly different soils. There were 

 differences ; but the figures, taken under the adverse conditions of 

 the experiment, are in no way conclusive. Beside, the experi- 

 ment was not well planned for a comparison of the two vineyards, 

 since the varieties, with but three exceptions, are different and the 

 numbers of vines of these are not the same. 



The crop on the grafted vines was increased through the setting 

 of more bunches and the growth of larger bunches and berries. 

 The increase in number of bunches was easily determined by actual 

 count but for the statement regarding size we have only the fact 

 that the proportion of unmarketable grapes was greater on the 

 ungraf ted than on the top-worked vines. The greater fertility of the 

 varieties on other than their own roots cannot be ascribed to larger 

 vines. jSTo data are available as to size of vines but judging by the 

 eye alone the grafted vines do not make as much wood as do the 

 varieties on their own roots. 



The quality of the crop, color of fruit, keeping capacity, value 

 of the grapes for wane or grape-juice, the latter depending largely 

 on sugar and acid content, could not be considered in this experi- 

 ment though it is probable that there are greater or less differ- 

 ences in all these characters — and all are very important. 



So far as yield, at least, is concerned, the results of this experi- 

 ment are in accord with those of many experimenters abroad and 

 in California. So, too, in this State records of grafted vineyards, 

 collected from grape-growers and the press, show that when a 

 grape is grafted on a congenial stock the yield is generally greater 

 than when the variety is growni on its own roots. 



Time of maturity. — The grapes on the grafted vines ripen a 

 few days earlier than those on their own roots. This statement 

 holds, in particular, as regards Gloire and Clevener but it is not 

 certain that there is a constant difference in the time of ripening 

 between the same varieties on St. George and on ovm roots — in 

 fact, some varieties on the last named stock were retarded in time 

 of maturity. Ripening notes were not kept accurately enough nor 



