Smithsonian Report, 1912. — Legendre. 



Plate 2. 



461 hours. 58 hours. 



PiQ 5 -Growth of Nerve Fibers in a Fragment of an Embryonic Frog 

 (Harrison, 1910.) iSee also Pl. 3.) 



A portion of the spinal cord is srowing in coaKulaU.d ly.nph from fibers which are in- 

 creasing more and more in length. 



