CALIFORNIA HIVE. 151 



face of the block, to allow it to turn smoothly ; the 

 block is attached to the hive by a screw in its cen- 

 ter, forming a pivot, on which it turns, and in such a 

 position that the aperture in the block will correspond 

 with the one in the hive ; it will then admit air with- 

 out allowing the bees to pass ; reverse the ends and 

 the air is excluded, and by turning it half round, a 

 passage is opened for the bees. 



K. Apertures in the sides or stiles X one seen 

 and one unseen ; they are used for upward ventila- 

 tion. 



L. Apertures the same as above, but made to ad- 

 mit air into the ventilating chamber. 



All the apertures in the hive and all the ventilat- 

 ing blocks are made of the same size. 



Z. Lid, attached by hinges x x to main front board 

 W. 



Plate xiv, fig. 29, rear view, showing the hive open. 



D. A wire, to which is attached a curtain (7, which 

 is used to prevent light passing from the ventilating 

 chamber through the passage, admitting air to the 

 bees. 



F. Cross piece, movable, for the purpose of exam- 

 ination and cleaning the hive, without removing the 

 frames. 



n. Knob, projecting one-half inch, so as to touch 

 the door when closed. 



Cr. e An aperture one and a half inches in diame- 

 ter, covered with screens, through which air finally 

 reaches the bees. 



