234 THE UNFERTILISED EGG AS A [pt. iii 



tunately all observers agree (Purkinje; von Baer; Coste; Kiitter; 

 Taschenberg; Wickmann and Patterson for the hen, Blount and 

 Patterson for the pigeon, Kiitter for the hawk, and Wickmann for 

 the canary) that the pointed end passes first down the oviduct. It 

 appears that the egg must turn right round in the act of being laid, 

 and Bartelmez, indeed, has seen this occur. Curtis has shown that 

 the shape of the egg depends to some extent upon its size and this 

 biometric observation was afterwards confirmed by Pearl & Curtis. 

 Many abnormalities have been reported in eggs. They need merely 

 be mentioned here with their authorities, thus : 



General. 



Hargitt. 



Henneguy. 



Bartelmez. 



Eggs containing masses of tissue^ more or less organised. 



von Nathusius. 



Gliicksmann. 



Benjamin. 



Dwarf eggs. 



Pearl & Curtis. 



Fere. 



Benjamin. 



Ovum in ovo. 



Herrick. 



Chidester. 



Weimer. 



Rosnatovski. 



Camerano. 



Pearl & Curtis. 



Racah. 



Benjamin. 



Roberts & Card. 



Hilden. 



Double and triple-yolked eggs. 



Hargitt. 



Parker. ' 



Patterson. 



Glaser. 



Curtis. 



Inadequate shell. 



Riddle & King. 



Dwarf or absent yolk (ovum centennium^). 



Mercier. 

 Szuman. 

 Bugnion. 

 Gelabert. 



^ See Sir Thos. Browne, Pseudodoxia Epidemica, Bk iii, ch. 7, "Of the basilisk". The eggs 

 of Chelonia also, according to Deraniyagala, are sometimes laid without yolks. 



