一、引言若干年前,第脱维楼(Detwiler 1918)氏,把美西螈(Amblystoma punctatum)胚的将能发生前肢的區城内物質,徒胚体上取出来,移植到一個不是生肢的區域,让他发生,结果仍然发生出一個前肢。後来爱克曼(Ekman 1921)和史推尔(stohr 1924b)先后做了相類似的试验,他们从赤腹蟾(Bombinator)的胚体,取出他的将能发生心臟的物質,移植到一個纯由外胚层组成的球囊裹去,让他发生,结果仍能发生出一個正常的心臟来。从这些事实,很清楚的看出来,心 I. INTRODUCTION Several years ago, Detwiler (1918), took the material from the forebrain of the Amblystoma punctatum embryo on an embryo body and transferred it to a non-limbed The area that made him happen, the result still came out of a forelimb. A similar experiment was later carried out by Ekman (1921) and Stolhr (1924b), who removed from his Bombinator embryos the substance from which the heart would develop and was transplanted to a pure The balloon, made up of ectoderm, wraps around and lets him happen, and the result is still a normal heart. From these facts, it is clear that the heart