14 BULLETIN 856, U. S. DEPARTMENT OF AGRICULTURE. 
parison with its behavior when growing as an entire plant on its own roots. T 
illustrate, the table shows that as to congeniality the Panariti when grafted en 
Aramon X Rupestris Ganzin No. 1 was rated at 96, when on Dog Ridge at- 
and when on Salt Creek at 85. This shows that the Panariti variety, whick 
well adapted to the conditions in the Fresno Experiment Vineyard, when graft 
on these stocks at the same time under the same conditions, with the se 
treatment in the same vineyard, varied in growth and behavior in compari’ 
with the variety on its own roots in accordance with the above ratings. — 
Columns 8 and 4 show the earliest and the latest date of starting into growta 
and of blooming, respectively, on the 10 stocks during the 10 years. These data 
are given as a basis of comparison with other grape varieties growing in the 
same locality. As the vines must be ringed while they are blooming, the blosso.r 
ing data also indicate the time of year when the ringing must be done.  ~- 
Column 5 shows the earliest and the latest date of fruit ripening on’ the 
stocks during the 10 years. This serves to show that currant grapes can be 
grown in advance of other raisin grapes and that they may be sun dried before’ 
the fall rains start-in districts where other raisin grapes ripen too late. 
Columns 6 and 7, respectively, show the yield of fruit per vine that the 
Panariti check vines bore in 1917 on each of the 10 stocks, compared with the 
yield of fruit per vine borne by ringed Panariti vines on the same stocks grow- 
ing side by side, with otherwise the same care and treatment given them the 
same year. 
Columns 8 and 9, in like manner, afford a comparison of the yields of fruit 
in 1918. 
~ Columns 10 and 11 compare the sugar content (Balling scale) of the fruit of 
the Panariti variety on each of the 10 stocks in the years 1917 and 1918, 
respectively. 
Columns 12 and 13 compare the acid content (grams per 100 ¢. c.) of the 
fruit of the Panariti variety on each of the 10 stocks in the years 1917 and 1918, 
respectively. 
Table IV shows the relative behavior of two young Panariti vines 
(ringed), each growing on 15 additional stocks, during a 4-year 
period, the vines being trained to a trellis. Explanations similar to 
those given for the same columns in Table IIT apply to columns 1 to 5 
in Table ITV. Columns 6 and 7 show the relative quality and yield 
of fruit of the Panariti vines on each of the 15 different resistant 
stocks. 
The data in Table IV relating to the behavior of young Panariti 
vines trained to a trellis for only two vines each on 15 resistant-stock 
varieties do not allow a fair comparison with data in Table III of the 
behavior of older vines trained to stakes, but promises of larger 
yields with trellis training are indicated. More elaborate tests of 
these and other stocks are now under way to obtain more con- 
clusive data as to congeniality. 
The results of the ringing experiments for 1919 have not been 
compiled as yet. It is known, however, that they corroborate and 
strengthen the results obtained in 1917 and 1918, and that the actual 
yields in 1918 were fully 10 per cent heavier than those of 1917, when 
the heaviest crop that up to that time had been grown was obtained. 
