Llewar LucKejc nnd Whitehead. 490. The Xtructure of the Phosphonitrilic Halides. By M. J. S. DEWAR,E. A. C. LUCKEN, and M. A. WHITEHEAD. The electronic structures proposed by Craig for the cyclic polymers (L4B),t of which the phosphonitrilic chlorides are typical examples have been reconsidered. It is concluded th