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W. J. O`Leary and R. R. Herries visited BMI to review the progress of subcontract research on extended fuel elements. 1. Three ``pinhole`` corrosion samples, bonded at ERL by fluid pressure, have been tested in boiling distilled water for, 624 hours with no evidence of undercutting corrosion. 2. A series of 30 samples is being prepared to investigate the effect of higher bonding pressures on resistance to undercutting corrosion. 3. A 25-pound lot of Horizons` thorium is analyzed and has been compacted in preparation for consumable electrode arc melting.

1. The r a t e s of photosynthesis and subsequent respiration of Chlorella pyrenoidosa were measured using an oxygen analyzer (sensitive to paramagnetism). The energy absorbed during the photosynthesis periods was determined and the quantum requirement was calculated. 2. Dark respiration r a t e was found to depend on the r a t e of light absorption during the period of photosynthesis, and increased with increasing photosynthesis rate. 3 . The quantum requirement, corrected for respiration, varied from 4. 9 ( a t a ratio of photosynthesis to respiration of 1.4) to 6. 9 (at a r a t i o of 12). Both uncorrected and corrected quantum requirements approach an experimental value of 7. 4 a t high light intensity. 4. The lower quantum requirement obtained a t low light intensity is believed to be due to a relatively greater importance of contribution of energy from respiration t o photosynthesis. An expression i s derived for the relation between this contribution and the enhancement of dark respiration due to the level of photosynthesis to which the plants a r e conditioned. 5. Attempts to obtain the blue -light stimulation of photosynthesis with algae photosynthesizing in r e …