3IO W. M. BALDWIN. 



groups of substances may be susceptible to the influence of the 

 rays while still in the living ovum. Exovation as the direct 

 result of the application of a great amount of energy may be 

 cited as an instance of this alteration. The normal histological 

 features of the embryo, and of the adult tadpoles, however, 

 argue the presence of a process of restoration or of regeneration 

 during the time of development of the embryo of the changes 

 which were brought about through the activity of the rays. 

 It might be assumed, accordingly, that the chemical modifica- 

 tion thus artificially produced is gradually rectified during the 

 developmental cycle but during the early stages of this process 

 the substances involved are incapable of entering into their 

 normal functions in the chemical elaboration of the pro-anlagen 

 and anlagen. The resultant action of these altered substances 

 might be interpreted, therefore, as that of an inert body which 

 serves, as was seen to be the case with the spina bifida embryos, 

 as a check to the gross, mechanical shiftings characteristic of 

 the normal genesis of the anlagen. The absence of an area of 

 altered protoplasm or of organic defects in the adult tadpole 

 is the basis for the logical argument that the chemical readjust- 

 ment of the protoplasm, altered by the rays, is ultimately com- 

 pleted to the degree that this protoplasmic mass does enter 

 finally into its usual function in the elaboration of the normal 

 anlagen. 



BIBLIOGRAPHY. 

 Agulhon 



'12 Ann. Inst. Pasteur, XXVI., i, p. 38. 

 Baldwin 



'15 Anat. Rec., IX., 5, p. 365. 

 Bierry, Henri, and Ranc 



'n Compt. rend. Acad. Sci., (Par.) CLIL, 23, p. 1629. 

 Bovie 



'13 Science, XXIV.. p. 373. 

 Cercelet 



'10 Rev. vit., XXXIII. , 842, p. 124. 

 Chauchard and Mazone 



'n Compt. rend. Acad. Sci., (Par.), CLIL, 24, p. 1709. 

 Euler 



'12 Abst. in Ztschr. Bot., IV., 6, p. 450. 

 Henri 



'12 Compt. rend. Acad. Sci., (Par.), CLV., 4, p. 315. 



'14 Compt. rend. Acad. Sci., (Par.), CLVIIL, 14, p. 1032. 



'14 Compt. rend. Acad. Sci., (Par.), CLIX., 4, p. 340. 



