The Monoiodo Derivative of ttc-Difhenylbenzene 2485 so that discrepancies at the higher temperatures presumably have their origin in one or both of these components of CP. We conclude, then, that one or more of the medium-valued frequencies, possibly v 17,11 have been assigned values somewhat too low, and/or that, the constant b in the expansion formula12 has been set somewhat too high.(11) See ref. 5, p. 68, (12) The constant a which gives the lattice portion of the expansion term, presumably is essentially correct because of the satisfactory agreement below 170eK.

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The 30 square foot filter has five auxiliary centrifugal pumps, one vacuum pump, one compressor for refrigeration, one blower, one agitator, and a motor drive; hence no decrease in the speci-

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