402 



PASTURAGE AND OVERSTOCKING. 



device (Fit;-. 155). A smooth f;lass surface moistened ^^-itli 

 thin honey is covered with a screen placed in a slanting posi- 

 tion and graduated. The bees which reach the farthest on 

 the glass may be selected for breeding, provided they are 

 equally proficient in other respects. 



;i-^*^ 



T^-^l/^,^^^'"r'-^^,^yU.- 



Pig. 157. 



EED CLOVER. 



(Prom Vilmorin-Andrieux, Paris.) 



Another desirable attainment is red clover with a shorter 

 corolla. This will probably be secured only by hybridiza- 

 tion. 



703. The linden, or bass-wood (Tilia Americana, fig. 158) 



