No. 5-] STRUCTURE JN AN ABNORMAL PIGEON. 213 



was continually shivering and trembling. The same was true 

 when a mate was placed in her cage. Although a number 

 of different mates were placed with her at various times, she 

 remained sterile. She was about two years old when killed and 

 had never laid an Q^^g. 



In general appearance she was a very disreputable looking 

 fowl. Her plumage was always ruffled and disordered, the 

 large feathers of the tail being especially ragged and rough 

 looking. Her voice resembled that of neither the ordinary 

 male nor female, but was a sort 

 of curious little crow, unlike 

 anything I had ever heard. 

 One eye was abnormal and 

 gave her an odd, staring look. 



Upon dissection the ovary 

 from a general view seemed 

 normal, but when sectioned 

 and examined under the mi- 

 croscope many peculiarities of 

 structure were discernible. 



There were very few of what 

 could be called normal eggs. 

 The abnormalities were of sev- fig. 2.-x37o- a double egg showing one nucleus 



and centrosome. The follicle cells are absent on 

 eral kinds, but a given type one side. <r, centrosome;/, folllcle; «, nucleus; 

 11 -IS, sphere. 



was generally more or less 



localized. The eggs varied in size, from small ones just visible 

 under the low power of the microscope, to those measuring a 

 fraction over a millimeter in diameter. 



The first peculiarity to strike the attention was the large 

 number of double eggs ; that is, two eggs lying within one 

 follicle (Figs. 2, 3, and 4). Sometimes the follicle was absent 

 wholly or in part, but in such cases the relation was yet so 

 close as to be easily distinguishable. Often no intervening 

 membrane was present between the two eggs, and the appear- 

 ance was that of an &^^ cell containing two nuclei (Fig. 9). In 

 places three and even four eggs were to be seen within a com- 

 mon follicle. In general, the multiple eggs seemed to lie in 

 colonies ; that is, where one case occurred, a number were 



