Abstract
Abstract The structure of an iridescent virus (SIV), which affects the larva of Sericesthis pruinosa , is described. SIV is indistinguishable in size and shape from Tipula iridescent virus. No evidence was found for the presence of 812 capsomeres in SIV. A number of experimental techniques, including the combination of the surface layer with antibodies or polymers of charge opposite to that of the surface, provided evidence that a diffuse surface coat of the order of 500 A thick covers the virion of SIV. The inter-particle spaces in the hydrated crystal, which are of the order of 1000 A, are thought to be maintained by the close packing of the hydrated coats of the particles and not by long-range forces immobilising water shells.
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