ENOLOGICAL STUDIES. 11 



This sample was analyzed at Sandusky, and portions of the fresh 

 fruit were sent to Bryan and Hartmann. Two specimens of juice 

 from the same sample were also sent to each analyst, one of which 

 had been preserved with mercuric chlorid and the other sterilized by 

 heating the samples slowly to 98 C. in bottles tightly corked and 

 submerged in water. 



The results obtained by Bryan and Hartmann on these check 

 samples are remarkably close as to total sugar, save on the fresh 

 fruit, and this might easily have been due to variation in the samples 

 sent out. It is not possible to sample grapes by bunches very closely, 

 and this seedling shows marked differences in the total sugar in the 

 analyses of the fresh fruit. But the bottled samples of grape juice 

 were identical, as the results, with the exception of the polariscope 

 readings, show. Regardless of these slight discrepancies, the results 

 serve to establish beyond dispute the main point, i. e., that the results 

 obtained at the Sandusky Laboratory are essentially correct and 

 that this grape normally contains a large percentage of sucrose. 

 Mr. Bryan also checked the sucrose determinations by inversion 

 with invertase, and obtained a close agreement with the results on 

 sucrose by acid inversion. 



NOTES ON SAMPLES ANALYZED FOR SUCROSE IN 1910. 

 SEEDLING. 



Field No. 1. Fine bunches; perfect berries; mostly colored. 



12. Fine bunches; perfect berries; appear ripe to eye and taste. 



24. Fine bunches; perfect berries; does not appear riper than previous 



sample. 



50. Bunches small; perfect berries; practically ripe. 

 131. Bunches small; perfect berries; fully ripe. 



HAYES. 

 34. Bunches small; berries medium ; not fully ripe. 



ILLINOIS CITY. 

 141. Bunches medium; good fruit. 



NECTAR. 



293. Fine compact bunches; large berries; excellent fruit. 



POCKLINGTON. 



4. Fine bunches and berries; quite green. 



14. Small bunches; fine berries; not ripe. 



25. Small bunches; fine berries; not ripe. 

 48. Fine bunches and berries; nearly ripe. 

 66. Fine bunches and berries; ripe. 



(By mistake the pickers harvested the reserved vines and no further examinations 

 could be made of this variety.) 



