REPRODUCTION IN THE DOMESTIC FOWL. 1 95 



small hard-shelled dwarf egg surrounded by very thick albumen. 

 This small egg had a short stalk which was open at the end. 

 The enclosed egg including the stalk was filled with a clear thick 

 albumen. The stalked end of the enclosed egg lay toward the 

 blunt end of the enclosing egg. Evidently this short-stalked 

 dwarf egg had been returned from the shell gland to the albumen- 

 secreting region without reversing its poles and without acquiring 

 an egg membrane going up. It had then evidently furnished the 

 stimulus for the formation of the enclosing envelopes. 



A photograph of specimen 12 is shown in Plate III., Fig. 2. 

 This egg was much like specimen n, but was much larger. 

 The complete egg weighed 32.0 grams. Both enclosed and 

 enclosing eggs had hard shells. The enclosed egg contained a 

 mass of chalazal fibers surrounded by rather thin albumen. 

 One end of this egg was contracted to a short stalk-like portion. 

 There was a circular area at one side of the end of this stalk- 

 like appendage which was not covered with either membrane or 

 shell. That is, the albumen was exposed. The enclosed egg 

 weighed 7 grams. Externally it was lightly covered with a 

 mass of chalazal-like fibers which projected from the poles into 

 the albumen. In the mass at the finished end was a small drop 

 of yolk and a small lump of hardened albumen. Surrounding 

 the central mass formed by the dw r arf egg, yolk drop and lump of 

 hardened albumen with their wrapping of chalazal-like threads 

 were layers of thick and thin albumen. The unfinished end of 

 the included egg lay toward the blunt end of the including egg. 

 Evidently without turning around the enclosed egg had backed 

 up the duct nearly to the funnel mouth. It had not acquired 

 an egg membrane going up. It had there united with the drop 

 of yolk and the lump of hardened albumen. Either these 

 particles or the included egg, or both together, had furnished 

 the stimulus for the secretion of the egg parts of the including egg. 



Specimens 13, 14 and 15 are so nearly alike that one descrip- 

 tion will suffice for them all. These eggs varied in weight from 

 12.5 to 15.0 grams. Each egg was hard-shelled. A diagram of 

 No. 13 is given in Fig. 7. With slight modifications in the size 

 and shape of the irregular mass of yolk this diagram would 

 represent equally well either of the other two eggs. In each of 



