52 



Florence R. Sabin. 



Soon after these knobs appear (in about fifty-five minutes), similar ones 

 develop about them which have fine connections with them, thus forming 

 a small cluster. The new ones are located partly on either side of the first 

 and partly superficial to them. Their injection now shows discreet tiny 

 clusters, somewhat like bunches of grapes, connected, as were the earliest 

 knobs, with the same intersegmental veins. These clusters are still separate 

 from one another. 



„ ™ i;T^ r y^f- P la S ram fr °m an reconstruction of the veins and 

 nerves of the cervical and upper thoracic regions of a chick embrvo 13 5 

 mm long, after 5 days and 10 hours of incubation; rightsioT T Praf- 

 cardma vein. 2. Post-cardinal vein. 3. Duct of Cuvier. 4 Intersegmental 



vesTeuf rZJ- , Lateral 1 ! rou P ° f ocular ^nds and veno-lym^hai 

 vessels 9. Spinal (cervical) nerves. 9a. Brachial plexus. After Miller 

 Amer. Jour of Anat, 1912, Vol. 12, tig. 12. Miner, 



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