Regeneration . the egg correspondsvery often to the median plane of the body of the embryo.^ Thisrelation suggested that there might be some causal connection betweenthe two phenomena in the sense that the first cleavage plane dividesthe material for the right side of the body from that of the left a descriptive sense this would be, of course, true if the two planesdo really correspond, and if there was no later shifting of material 1 Rouxs earlier experiments in 1885, in which the unsegmented or segmented egg wasstuck and a part of its contents removed, the remaining part making a who
Regeneration . the egg correspondsvery often to the median plane of the body of the embryo.^ Thisrelation suggested that there might be some causal connection betweenthe two phenomena in the sense that the first cleavage plane dividesthe material for the right side of the body from that of the left a descriptive sense this would be, of course, true if the two planesdo really correspond, and if there was no later shifting of material 1 Rouxs earlier experiments in 1885, in which the unsegmented or segmented egg wasstuck and a part of its contents removed, the remaining part making a whole embryo, willbe considered in another connection. 2 This had been first discovered by Newport in 1851. 216 REGENERATION IN EGG AND EMBRYO 217 across the middle line, but whether the two phenomena are causallyconnected, or are merely due to a coincidence, could only be determinedby further experiment. The observations themselves are not beyondquestion, for the two planes do not always coincide, and may be even.
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