OF ARTS AND SCIENCES : JANUARY 9, 1866. 



79 



Fig. a. 



the regularity of the comb is preserved.* This, however, is not done 

 at definite intervals ; for in one piece of comb two intercalated series 

 were nine cells apart, in another, six, and in another, four. 



Mr. Langstroth has given a good figure, illustrating the form of the 

 mouths of some of the cells where the worker and drone cells come 



together.! 



The presence of a fourth face in the base of the transitional cells is 

 by no means constant, as asserted by several observers, for we have 

 seen the change from worker to drone cells without the fourth face 

 appearing in any of them. 



In all the transitional cells of brood-comb cocoons are invariably 

 found, showing that they have been occupied. It is obvious that some 

 of these would be either too large for a worker or too small for a 



* This figure was made from a piece of old brood-comb, in which the lip of the 

 drone cells was very much thickened, and the mouths were almost circular. Tiiere 

 is nothing abnormal in this, except at those points where the row of intercalated 

 cells, as a and h, connect with the drone cells. 



t Treatise on the Bee, p. 74 and PI. XV. jj 



