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The aim of this project has been to gain experience in electron microscopy and to investigate selected problems of ultrastructure in root tips using techniques of thin sectioning and freeze-etching. The work was conducted while employed as a full time University Lecturer. Studies began in 1963 and were continued in 1964 during visits to the Physics and Engineering Laboratory (P.E.L.) D.S.I.R., Lower Hutt. Towards the end of 1965 practical work began at Canterbury following the acquisition ofdoi:10.26021/9043 fatcat:qp3xrddq3bb45a7fna7ufbbeqi