Archive image from page 122 of The development of the frog's. The development of the frog's egg; an introduction to experimental embryology . developmentoffro00morg Year: 1897 Ch. XI] EFFECT OF IXJURIXG A BLASTOMERE 107 hot needle. The needle is carefully sharpened, and is re- sharpened after each egg is operated upon. It is best to pierce the blastomere in the black hemisphere near the first cleavage-plane. The needle passes through about a half (or more) of the blastomere. When the needle is withdrawn, a greater or less amount of the contents of the blastomere pro- trudes where the blastome
Archive image from page 122 of The development of the frog's. The development of the frog's egg; an introduction to experimental embryology . developmentoffro00morg Year: 1897 Ch. XI] EFFECT OF IXJURIXG A BLASTOMERE 107 hot needle. The needle is carefully sharpened, and is re- sharpened after each egg is operated upon. It is best to pierce the blastomere in the black hemisphere near the first cleavage-plane. The needle passes through about a half (or more) of the blastomere. When the needle is withdrawn, a greater or less amount of the contents of the blastomere pro- trudes where the blastomere has been injured. The egg after operation is returned to the water. It is necessary to keep the eggs under careful observation, because sometimes the blasto- mere has been onl} slightly injured and continues to develop more or less irregularly. Such eggs should be removed.
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