500 Intestinal Folds and Villi in Vertebrates 



PLATE V. 



Figures of wax reconstructions from the intestine of chick embryos. 



Figs. 60 and 61. Folds from 8-day chick. Epithelium alone shown 

 (near the pyloric valve). X 100 diameters. 



Fig. 62. Part of intestine from 9-day chick (near pyloric valve). 

 X50 diameters. 



Fig. 63. Part of intestine of 11-day chick, looking almost directly 

 down on folds. X 50 diameters. 



Fig. 64. Eeconstruction of single fold of 11-day chick. X 100 di- 

 ameters. 



Fig. 65. Eeconstruction of intestine of a 14-day chick's large intes- 

 tine. X 50 diameters. 



Fig. 66. Eeconstruction in wax from the caecum of a 14-day chick 

 when villi are quite well formed. X 50 diameters. 



Fig. 67. Wax reconstruction from caecum of 13-day chick. X 50' 

 diameters. 



Fig. 68. Part of intestine from 13-day chick. Folds quite wavy. 

 X 50 diameters. 



Fig. 69. Small 14-day chick single fold near the pylorus. X 100 

 diameters. 



Fig. 70. Eeconstructions in wax of a single fold near the pyloric 

 talve from the intestine of an advanced 14-day chick. The fold has 

 begun to break into villi at the fold angles. X 100 diameters. 



