Respiratory activity (Q
O2) and R. Q. of the ovary tissues of Lilium speciosum isolated at various stages of fertilization were estimated. Histological examinations were conducted in parallel. The results obtained are as follows:
1. Q
O2 showed little change by the pollination.
2. Q
O2 increased markedly at the period 90 hours after pollination, when the conjugation of male and female nuclei was observed.
3. The second increase of Q
O2 came 200 hours after pollination, when free-nuclear divisions took place in the endosperm.
4. Marked increase of R. Q. was observed at the period 90 hours after pollination.
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