418 



ELEANOK LINTON CLARK 



of a slight amount of ink into these already distended vessels, 

 the violent movement of the shoulder, at the time of the periodic 

 muscular spasms, caused the delicate walls of this sac to assume 

 the fuzzy appearance characteristic of extravasations. 



s.s. 



2Lt 



Fig. 6 Chick of 8 days (.23 mm.). Stage of beginning anterior circulation 

 in the dorsal part of the side lymphatics, retarded flow in the supra-scapular 

 region. The circulation for the rest of the superficial lymphatics is posterior, 

 as in figure 5. L.H ., lymph heart, now in the form of a sac; S.S., supra-scapular 

 sac; IL, original lateral lymph duct; 2L., newly formed lateral lymph duct. X o. 



Cleared specimens show that the newly developed cartilage 

 of the shoulder has crowded back the deep jugular lymphatics 

 and that the connections between these and the superficial 

 vessels of the supra-scapular region has shifted, so that instead 



