. The American journal of anatomy. Fig. 18 Cells from a 2-day culture of heart from a 5-day chick; X 540 a in anaphase has about 140 mitochondria, while 6 has only about 60, theyoung daughter cell c has 37, the two daughter cells d, d have 36 each; the oldercells e, /, g and h have 39, 47, 58 and 56 mitochondria respectively. In the seriesi, j, k, I, the .young cell i has only 24, the older cells j and k have 41 and 42, whilethe mature cell I has 140 mitochondria. We have indicated that the daughter cells not only haveabout one-half the number of mitochrondria found in the maturecell
. The American journal of anatomy. Fig. 18 Cells from a 2-day culture of heart from a 5-day chick; X 540 a in anaphase has about 140 mitochondria, while 6 has only about 60, theyoung daughter cell c has 37, the two daughter cells d, d have 36 each; the oldercells e, /, g and h have 39, 47, 58 and 56 mitochondria respectively. In the seriesi, j, k, I, the .young cell i has only 24, the older cells j and k have 41 and 42, whilethe mature cell I has 140 mitochondria. We have indicated that the daughter cells not only haveabout one-half the number of mitochrondria found in the maturecells, but that the mitochondria are sometimes smaller. Does the increase in number during the growth period comeabout through division of preexisting mitochondria (a processwhich frequently takes place) or do mitochondria arise de novo?So far as our observations go, either or both processes may occur. MITOCHONDRIA IN TISSUE CULTURES 371 The only certain method to determine just how and when themitochondria increase is to follow sever
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