494 DAVENPORT HOOKER 
4. Complete reunion of the cord may be prevented by the 
interposition of mechanical obstacles to regeneration or by the 
too great separation of the cut ends of the spinal cord from one 
another. 
5. The tadpoles present a normal behavior as soon as motor 
and sensory connections have been established between the cord 
stumps. 
6. Multiple canales centrales have not been observed in the 
reunited spinal cords of these embryos. 
LITERATURE CITED? 
Born, G. 1897 Uber Verwachsungsversuche mit Amphibienlarven. Arch. f. 
Entw.-mech., Bd. 4, 8S. 349-465, 517-623. 
BrRown-S£fQquarD, C. E. 1849 Exposé sur la curabilité des plaies de la moelle 
épiniére. Compt. rend. Soe. Biol., t.1., p. 17. 
1850 Regeneration des tissus de la moelle épiniére. Compt. rend. 
Soc. Biol.,-t. 2; p. 3. 
1851 Sur plusieurs cas de cicatrisation de plaies 4 la moelle épiniére, 
avec retour des fonctions perdues. Compt. rend. Soc. Biol., t. 3, pp. 
77-79. 
Caroraso, L. 1889 Sulla rigenerazione del midollo spinale della coda dei 
Tritoni. Ziegler’s Beitrige, Bd. 5, 8S. 67-97. 
Coauitu, G. E. 1909 The reaction to tactile stimuli and the development of 
the swimming movement in embryos of Diemyctylus torosus, Esch- 
scholtz. Jour. Comp. Neur., vol. 19, pp. 83-105. 
1913 The primary ventral roots and somatic motor column of Ambly- 
stoma. Jour. Comp. Neur., vol. 23, pp. 121-143. 
1914 Correlated anatomical and physiological studies of the growth 
of the nervous system of Amphibia. I. The afferent system of the 
trunk of Amblystoma. Jour. Comp. Neur., vol. 24, pp. 161-233. 
FiscneL, A. 1914 Uber das Differenzierungsvermégen der Gehirnzellen. 
Arch. f. Entw.-mech., Bd. 40, S. 653-665. 
FRAISSE, P. 1885 Die Regeneration von Geweben und Organen bei den Wir- 
belthieren, besonders Amphibien und Reptilien. Kassel u. Berlin. 
2 It is not within the province of this paper to review the literature on the 
subject. The reader is referred to the excellent reviews of Paul Fraisse (*85), 
Keresztszeghy and Hannss (’93) and J. F. Marchand (01). 
