Ill 



PRIMARY INDUCTION EXPERIMENTAL DATA 



395 



TABLE 1 



GILADl's OPERATIONS ON MIDDLE GASTRULAE OF PLEURODELES 



Embryo Qiwtalions Tel Di Mes Rhomb Sp.c. Olf.pl. Paraph. Eyes Epipli. In/ Ear ves. Remarks 



iiiiisiiii; ill embryo + riid + 



found in fold Pros. 



missing in embryo + + + 



found in fold + + 



missing in embryo + + + 



found in fold Pros. 



missing in embryo + 

 found in fold + 



+ + 

 + + 



7nissing in embryo L, + A 



(dam.) 



found in fold + + + 



missing in embryo dam. P + 



found in fold ? 



missing in embryo 

 found in fold 



rud. + 



+ 



missing in embryo dam. rud. + 

 found in fold + + 



missing in embryo 



found in fold 



missing in embryo 



found in fold 



missing in embryo 



found in fold + + + 



m.P. A 



? + 



M + P A 



i + i 

 (rud.) 



synrh. 

 comp. 



i + i 

 (rud.) 



M+P A synrh. 



synrh. 



+ big + tap 



+ 



I + I + 

 (rud.) 

 big. + 



cyclop 



cyclop 



+ ? + 

 + 



duct. 

 end. 



ant. ganglia 



ganglia 



microcephalic 

 pros. + mes. 



strong 

 microcephaly 

 ganglia, fin 



I microcephalic 



(rud.) pros. + mes. 

 mixed brain 

 structure 



Explanation of Table 1 



Operations on middle gastrulae of Pleurodeles. 



For each embryo, the two superimposed horizontal rows tell which organs are missing 

 in the embryo as a consequence of the ablation of a neurectoblast strip, and which ones are 

 present in the fold made in this strip and grafted on the ventral side of the same gastrula. 

 In the first row, + means the absence of the organ, in the second + means the presence of 

 an organ of moderate size. A = anterior; comp. = complex; dam. = damaged; due. end. 

 ~ ductus endolymphaticus ; Inf. = infundibulum; L = left; M = median; ?nP = most 

 posterior; P = posterior; Pros. = prosencephalon; R = right; rud. = rudimentary; 

 Sp.c. = spinal cord; synrh. = synrhinie; tap, = tapetum; ves. = vesicle. Except for 

 embryo L, the strip used is the most caudal part stippled on Fig. 59, f. The author has listed 

 the embryos according to the probable location of the excised strip (deduced from the 

 defects in the neural axis), those with more cerebral presumptive value placed first. 

 Compiled from Table II of Eyal-Giladi, 1954. 



Literature p. 483 



