402 PASTURAGE AND OVERSTOCKING. 



device (Fig. 155). A smooth glass surface moistened with 

 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. 



Fig. IBT. 

 RED CLOVER. 



(From Vilmorin-Andrieux, Paris.) 



Another desirable attainment is red clover with a shorter 

 corolla. This will probably be secured only by hybridiza- 

 tion. 



702. The linden, or bass-wood {Tilia Americana, fig. 158), 



