8vo. vii. 361 pgs.Very Good condition blue cloth hardbound, no jacket. Clean, tight, unmarked with exception of owner name on front pastedown, light foxing to fore edge and several tiny check marks in table of contents. Sections include: symptomology - changes in appearance, physiological changes and host-plant metabolic changes; methods of transmission; assay methods; composition of virus particles; morphology of viruses;; inactivation; multiplication; movement; genetic variability; classification; control.#951.