NO. 14 SENSE ORGANS ON MOUTH-PARTS OF BEE McINDOO 



The experiments just described were repeated by making a candy of 

 powdered picric acid and honey. As an average for the 100 bees for 

 five counts, 45 per cent were seen eating the pure cane-sugar candy 

 at any one count, but none ate the candy made of picric acid and honey. 

 Judging from the three sets of experiments in which picric acid was 

 used, it seems that this acid in the liquid form effects a chemical 

 change in cane sugar, thereby causing bees to prefer candy mixed 

 with it to pure cane-sugar candy. 



Chinquapin honey, which has a bitter taste, was next fed to bees 

 as described on page 5. As an average for the 100 bees for seven 

 counts, only 3.4 per cent were seen eating at any one count. 



The following is a tabulated summary of the preceding results 

 obtained by feeding bees foods containing bitter substances. The 

 figures in the third to ninth columns represent the average per cent 

 or number of bees eating a particular food at any one count. 



TABLE IV 

 Experiments in Feeding Bees Foods Containing Bitter Substances 



Judging from the above table, it is plain that bees show preferences 

 between foods containing bitter substances. 



5. Experiments in Feeding Bees Foods Containing Sour 



Substances. 



Twenty grams of honey were thoroughly mixed with 45 drops 

 of lemon juice. The lemon juice made the honey considerably thin- 

 ner and gave it a slightly different odor and a slightly sour taste. This 

 mixture and an equal amount of pure honey, after being divided into 

 five equal parts, were fed to fresh bees in the usual manner. As an 



