PLATE 2 



EXPLANATION OF FIGURES 



2 to 6 Five transverse sections of a 5 mm. toad embryo through a small portion 

 of the ventral region of the head to show the initial anlagen of the lymph sinus. 

 Series 25. X 1100. 



REFERENCES 



I., I., sinus anlagen /.,/., jugular tributary (see footnote 5, 



j.d.fj.s., right and left e.xternal jugular page 168) 



veins b.c, blood corpuscle 



2 and 3 Successive sections from the left side. Slide 1, row 4, sections 19 and 

 20. 



4 From the same side, three sections caudad. Slide 1, row 4, section 23. 

 Compare the Ijnnphatic rudiment (1) with the mesenchj-me in regard to yolk, 

 and note its solidity. 



5 and 6 Two alternate sections from the right side. Slide 1, row 4, sections 

 18 and 20. Observe the cavity of the h-mphatic (1) in the second sketch. 



18G 



