500 E. I. WERBER 



Even smaller, usually amorphous, meroplasts can be found in 

 some eggs as the only evidence of development. As the most 

 significant of all the meroplasts recorded may be regarded eggs 

 in which nothing could be found on the yolk-sac besides a very 

 small tissue fragment with an eye ('sohtary eye') (figs. 38 bo 41). 

 The morphology of such ova and their ontomechanical signifi- 

 cance will be discussed under a subsequent heading. 



* * * 



Of other deformities recorded in these experiments several 

 double monsters would seem to deserve description. Owing, 

 however, to limitations of space, the presentation of these obser- 

 vations is reserved for a paper (soon to be published) which is 

 to deal with a rather large number of various duplicities recorded 

 in more recent experiments. 



III. THE MICROSCOPIC ANATOMY OF THE MONSTERS AND CON- 

 CLUSIONS REGARDING THEIR MORPHOGENESIS 



This part of the work has yielded some very encouraging 

 results. It has, as I hope to make clear, contributed not only 

 a basis for rational interpretation of the morphogenesis of some 

 monsters, but also disclosed some general principles which may 

 underly the genesis of all malformations recorded in my experi- 

 ments, and possibly of such as occur spontaneously in a state 

 of nature. While for this reason an extensive study of these 

 terata would seem very desirable, I have so far not been able to 

 study more than a few common types. A more extensive treat- 

 ment of these experimental terata will follow this communica- 

 tion in further studies. 



In the present study I have given most attention to the mor- 

 phology of ophthalmic terata. 



A. CLASSIFICATION OF OPHTHALMIC TERATA 



There being, as I have mentioned before, a very great variety 

 of these deformities, a classification of them, although of neces- 

 sity arbitrary to some extent, would seem desirable. For, it is 

 obvious that the term 'cyclopia' in its present use does not 



