SPEMANN, H. 1931. Uber den Anteil von Implantat 

 und Wirtskeim an der Orientierung und Beschaffenheit 

 der induzierten Embryonalanlage. Zeitschr. Wiss. 

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 123: 389-517. (Detailed discussion of techniques and 

 theoretical considerations in the experimental determ- 

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1938. Ennbryonic development and induction. 



xii / 401 pp. 192 fig. Yale University Press. New 

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and E. Bautzmann geb. Wessel. 1927. Uber 



Regulation von Tritonkeimen mit UberschUssigam, und 

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SPERRY, R. W. 1945. The problem of central 

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SPIEGEL, A. 1928. Uber die degenerativen Verand- 

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 (Degenerative changes in Purkinje cells from new born 

 guinea pigs to old age.) 



SPIRITO, A. 1928. Osservazioni sul trapianto della 

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1928. Studi sul trapianto della vescicola ottica 



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 54-89. (Heterochronous transplantation of eye vesicles; 

 synchronisnn in developnnent of grafted and host eyes as 

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1928. Process! regolativi della regione 



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1929. Osservazioni sui processi regolativi in 



relazione alio sviluppo degli emisferi cerebrali negli 

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1929. Processi di rigenerazione e di regolazione 



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SPIRITO, A. 1930. Processi rigenerativi nell'encef- 

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1930. Rigenerazioni e regolazioni nell'encef- 



alo degli anfibi. Zeitschr. Wiss. Biol. Abt. D, Roux' 

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 (Bufo vulgaris, Rana esculenta, Triton cristata; ex- 

 tirpation of one-half head including eye and olfactory 

 organ; regeneration fprebrain with greatly augmented 

 mitotic activity; partial regeneration eye, failure of 

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SPIROV, M. S. 1930. (Acrania, anencephalia, 

 prolapsus linguarum, etc. ) (Some peculiarities of 

 the secondary face and of the skull of an asynnnnetrical 

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 Gistologii i Embriologii 9: 13 1-138. (Man; teratology; 

 description of a case of acrania, anencephalia, spina 

 bifida cervicalis.) 



1933. Ennbriogenez mosgowikh obolochek 



cheloweka. (Ennbryogenesis of the human nneninges.) 

 Russkii Arkhiv Anatomii, Gistologii i Ennbriologii 12: 

 229-254. (Morpho- and histogenesis; hematopoesis 

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SPOFFORD, W. R. 1945. Observations on the post- 

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 prospective significance of posterior neural plate 

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SPRATT, N. T., Jr. 1940. An in vitro analysis of 

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SPURLING, R. G. , W. R. LYONS, B. B. WHITCOMB 

 and B. WOODHALL. 1945. The failure of whole 

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SSAMARIN, N. 1926. Zur Frage Uber die Regenera- 

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 section of cord; Cajal and Bielchowsky stains after 

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STAUDINGER, Fritz. 1930. Heteromorphosen an 

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STEFFANELLI, A. 1931. Sulla struttura istologica 

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 embryo. ) 



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