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Morphological Studies of Maize Mosaic Virus I^*

Departamento de Virología, Instituto Venezolano de Investigaciones Científicas, Apartado 1827, Caracas, Venezuela

Particles of maize mosaic virus I are bullet-shaped, or hemispherical at both ends. Bullet-shaped particles in phosphotungstic acid measure 2550 x 900 Å, those in uranyl acetate 2410 x 730 Å. The particles appear to consist of an envelope with thread-like or knob-like protrusions, a helical structure composed of beaded units, a hollow cylinder and an inner core. The last has no visible structure but disintegrates often in somewhat spherical masses.

^* Some of the results were presented at the sixth Annual Meeting of the American Phytopathological Society, Caribbean Division, Maracay, Venezuela, 4–10 September, 1966.

Received 4 November 1966; accepted 12 December 1966.