106 University of California Publications in Agricultural Sciences [Vol. 3 



Table 1 — Effect of Age of Vine on Balling and Acid of Must of Muscat 



Grapes 



Vine Balling Acid 



Small, no. 1 24.7 .67 



Small, no. 2 27.7 .49 



Small, no. 3 27.6 .67 



Large, no. 1 22.0 .88 



Large, no. 2 23.5 .75 



Large, no. 3 23.6 .76 



Average, small 26.7 .61 



Average, large 23.0 .81 



Difference 3.7 —.20 



The results show rather strikingly that young vines ripen their 

 fruit earlier than do mature vines. This fact makes it essential that 

 samples, to be comparative, must be taken from vines of the same age. 



2. Comparison of Grapes from North and South Sides of Vines. 

 The whole first crop from three large Muscat vines was picked. The 

 bunches from the north and south sides of each vine were kept sep- 

 arate. They were crushed, pressed, and analyzed for Balling and acid 

 content. 



Table 2 — Comparison of Balling and Acid of Juice From Grapes Picked From 



North and South Sides of Vines 



Vine and side of vine Balling Acid 



1-N 21.3 .92 



1-S 22.7 .84 



2-N 23.5 .81 



2-S 23.5 .80 



3-N 23.1 .81 



3-S 24.1 .71 



Average, N side 22.63 .85 



Average, S side 23.43 .78 



Difference 80 —.07 



The tests indicate that grapes located on the south side of the vine 

 ripen more rapidly than those on the north side. This difference is 

 apparently due to the fact that the south side of the vine receives 

 more heat than the north side. 



3. Effect of Location of Bunch on Cane. Grapes of first crop, from 

 canes showing two bunches each, were picked and the bunches from 

 near the bases of the canes kept separate from those near the tip of 

 the cane. They were crushed, pressed, and analyzed for Balling and 

 acid. 



