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The magnetic susceptibilities of plutonium trifluoride and trichloride have been measured over the temperature range 90-600' K.

By C. J . MANDLEBERG and D. DAVIES.'lhe vapour pressure of plutonium tetrafluoride has been measured by Knudsen's effusion method, as modified by Phipps et al. Between 700" ant1 12OO0c, the vapour pressure can be represented by log,, p (mm. Hg) = 5-58 -10,04O/T; above 1200" a more volatile species occurs, whose vapour pressure can be represented by log,, p (mm. Hg) = 36.1 -54,18O/T.Above 1200" the residue remaining in the effusion pot is plutonium trifluoride and it is tentatively suggested that the species effusing above 1200" is the pentafluoride.

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