EFFECTS OF FROST UPON SORGHUM. 



161 



the plant, as has been supiiosed by many, but was an actual increase 

 in sugar. 



For comparison with the results just given, the results obtained in 

 1881, are, in part, repeated here. 



Two stages of development are selected for comparison — the elev- 

 enth, when the seed was just hard, and when the amount of juice was 

 at its maximum ; and the seventeeth, which represents several weeks 

 after the seed had ripened. 



The average analyses of the juices of 35 varieties of sorghum gave 

 the followius: results : 



Numbor of annlyses 



Juice from stalks 



Sn(Ti»se ill jiiice 



Gluooso in juice 



Solids in juice , 



Total solids in jnice. 



Available susar in juice 



Water in juice 



Sucrose expressed from stalks 



Glucose expressed from stalks 



Solids expressed from stalks 



Total solids expressed from stalks .... 

 Available suijar expressed from stalks 

 Water expressed from stalks 



Calculating these results to the stripped stalks, we find between the 

 eleventh and seventeenth stages the followins: : 



Gain in sucrose 19.19 per cent, or 1.33 per cent of stalks. 



Loss in glucose. 38..56 per cent, or .69 per cent of stalks. 



Gain in solids 38.42 ])er cent, or .6S per cent of stalks. 



Gain in total solids 13.88 per cent, or 1.42 per cent of stalks. 



Gain in available sugar 34.16 per cent, or 1.24 per cent of staiks. 



Loss in water 11. 4S per cent, or 6.29 per cent of stalks. 



It appears, therefore, conclusively established, that long after the 

 seed has througbly ripened, and, indeed, as in all of our results, until 

 the plant is killed by the frost, there is a steady increase in the amount 

 of sugar in the juice, which is actual and not due to loss of water; and 

 that this increase extends also to the available sugar, which, as will be 

 seen above, increased from the eleventh to the seventeenth stages 84.16 

 per cent, Avhile the sugar increased only 19.19 per cent. This re- 

 sult has been established by the continued experiments of the past 

 four years. 



In discussion of the effects of frost upon the sorghums, the follow- 

 ing quotation from "Sugar Planting and Refining," page 22, is so en- 

 tirelv iu accord with our own experience, that we give it in full: 

 11 



