388 



ARTHUR WILLIAM MEYER 



The earliest aiihige of ii lieiiial node wliich 1 found is repre- 

 sented in figure 9. This node which is 80 /j. in size represents 

 a condensation in the mesenchyme which has become circum- 

 scribed tlu'ough the development of a rather wide peri-nodal 

 space. Although it is sometimes difficult to be certain this 

 space is purely local and has no direct connection with the vas- 



'^ f^nmw \ 



Figs. 1 and 2 Cell islands in subcutaneous mesencliyme. Foetuses 27 and 

 18.5 cm. X 1340 and 920. 



cular or the lymphatic systems. The peripheral space which 

 is not complete is surrounded by a slight condensation in the 

 mesenchyme which suggests beginning capsule formation and 

 would hence justify one in regarding this space as the peripheral 

 sinus or as I prefer, the subcapsular space. No capillaries or 

 erythrocytes are contained in this anlage and the cellular dif- 



