DEVELOPMENT OF THE PIG DURING EIRST TEN DATS. 359 



PLATE 27. 



All the figures on this plate are camera drawings of sections of embryos, 

 or of the embryonal area of embryos of the pig. Tlie magnification in 

 each case is 380 times. 



Fig. 25 (Sus 32, No. 1).— Age 7 days. 



Fig. 26 (Sus 32, No. 1). — Age 7 days. The hypoblast in this specimen, 

 as in several others, is removed from the epiblastic knob. 



Fig. 27 (Sus 14, No. 2).— Age 7i days. 



Fig. 28 (Sus 14, No. 1).— Age 7^ days. 



Fig. 29 (Sus 33, No. 3).— Age 8 days. 



Figs. 30, 31, 32, 33 (Sus 18, No. 8). -Age 9^ days. These are four 

 sections through one specimen, namely, the 3rd, 5th, 9th, and lOlh of a 

 series of thirteen sections. 



Fig. 34 (Sus 18, No. 10).— Age 9^ days. 



Fig. 35 (Sus IS, No. 9). — Age 9^ days. Diameter of embryonal area 

 1 mm. 



PLATE 28. 



All the figures on this jilate are camera drawings of sections througb 

 portions of the walls of the blastocyst of the pig. All are magnified 380 

 times. 



Fig. 36 (Sus 28, No. 2).— The same embryo as Fig. 10. Age 10 days 

 2^ hours. Section through embryonal area. Whole embryo measured 3'57 

 X 2-31 mm. 



Fig. 37 (Sus 28, No. 2). — Another section through the same embryonal 

 area. 



Fig. 38 (Sus 28, No. 4).— Age 10 days 2| hours. Section through the 

 embryonal area. Blastocyst measured 4"06 X 2"60 mm. 



Fig. 39 (Sus 28, No. 5).— Age 10 days 2^ hours. Section through em- 

 bryonal area. 



Fig. 40 (Sus 28, No. 2).— Age 10 days 2A hours. Section through the ab- 

 enibryonic pole. 



Fig. 41 (Sus 28, No. 2).— Age 10 days 2i hours. Another section simi- 

 larly located to above (Fig. 40). 



Fig. 42 (Sus 28, No. 7).— Age 10 days 2^ hours. Section through the 

 wall of the blastocyst a short distance from the embryonal area. 



