Archive image from page 90 of The development of the frog's. The development of the frog's egg; an introduction to experimental embryology . developmentoffro00morg Year: 1897 CHAPTER VII THE PRODUCTIOX OF ABNORMAL EMBRYOS WITH SPINA BIFIDA Embryos of the frog are occasionally found that differ greatly from normal embryos. Roux, in 1888, first described one of these embryos and showed that a knowledge of its structure and method of development helped very much tow- ard an understanding of the processes that take place in the r

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