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In previous papers we have considered the standardization of photo­ electric cells for the measurement of daylight (Poole and Atkins 1935), the daily and seasonal changes (Atkins and Poole 1936a) in daylight in England, and the relation of these photo-electric scales to the visual scale of photometry (Atkins and Poole 19366). Though measurements of total radiation had been made in the tropics and though certain spectrophotographic records had been obtained, no measurements of daylight had, as far as we knew, been made by photo­ electric methods strictly comparable with those used in Europe and with the newer types of cell. Cells were accordingly standardized against those used at Plymouth, and were taken abroad for use.

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The reactions F + C2H2 and F + C4H6 (2‐butyne) were studied in a low pressure flow system using the IR‐chemiluminescence technique. The vibrational‐rotational state distributions for the product molecule HF were determined for various conditions. For F + C2H2 only secondary reactions can lead to vibrational excitation of HF; with an excess of F‐atoms HF(ν ≤ 7) was observed. For F + C4H6 the primary abstraction yields the vibrational distribution N1:N2:N3:N4 = 26:36:32:7. With an excess of F atoms ν = 5 and ν = 6 are populated. The possible secondary steps are discussed on the basis of our observations.

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