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19世纪胚胎学的研究已经得到重视，但是还很少有人想到从实验方面去研究发育的问题。达尔文的进化论所引起的兴趣，激发大家去研究比较解剖学，而赫克尔（Haeckel）的生物进化论启发许多学者从胚胎的结构发育中寻找证据，然而这些形态变化的机制依然未明。劳克斯（WilhelmR。UX
Research on embryology in the 19th century has received much attention, but few have thought of the problem of studying development from an experimental perspective. Darwin’s theory of evolution aroused interest and inspired everyone to study comparative anatomy. The biological evolutionism of Haeckel inspired many scholars to look for evidence from the structural development of embryos. However, the mechanism of these morphological changes remains unclear. WilhelmR.UX