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



19. 



Judging from the above table, it is seen that bees prefer pure cane- 

 sugar candy to any one of the above foods containing sodium salts, 

 and that they show preferences between these various mixtures. 



7. Experiments in Feeding Bees Foods Containing Potassium 



Salts 



The preceding experiments were repeated by using potassium 



bromide, potassium carbonate, potassium cyanide, potassium ferro- 



cyanide, potassium iodide, and potassium nitrate. When potassium 



bromide, potassium ferrocyanide, and potassium nitrate were mixed 



TABLE VII 

 Experiments in Feeding Bees Foods Containing Potassium Salts 



with pure cane-sugar candy, the mixtures emitted odors and tasted 

 like pure cane-sugar candy as far as the writer could detect. Potas- 

 sium carbonate and potassium iodide did not change the odor of the 

 cane-sugar candy when mixed with it, but each gave the mixture a 

 slightly bitter taste. The potassium cyanide gave the cane-sugar 

 candy a slightly bitter taste and a comparatively strong odor like 

 cyanogen. It changed the candy from white to a lemon-like color. 

 Three of the other mixtures were also changed slightly in color. The 

 six mixtures were fed, two at a time, to fresh bees, and then each 

 one was fed with pure cane-sugar candy in the manner described for 

 the foods containing the sodium salts. When the bees ate the mix- 

 tures containing potassium bromide, potassium carbonate, potassium 

 iodide, and potassium nitrate, they soon became sick and thereafter 



