The value of electron microscopy in the study of organic crystals is reviewed, together with its limitations in terms of radiation damage. Tne mechanism of formation and growth of crystals on a substrate is discussed, on the basis of electron microscopic observations, of both small crystals and the molecular structure of growth boundaries. Several examples of polycyclic hydrocarbons and phtnalocyanines are described. A distinction is made between the information obtainable about disorder in a crystal, and precise measurements made by electron crystallography involv.ng structural averaging. rhe Electron Microscope (New York Plenum) Buseck P R, Cowley J M and Eyring L 1988 High R~solution Transmission Elecrmn Microscopy (Oxford Oxford University Press) Spence J C H 1981 Erperimental High Resolution Electron Microscopy (Oxford: Clarendon) Wilson A J C 1992 InternarioMl Tables for Costallography (Dordrecht: Kluwer) Symonds M C R 1982 Ultramicmxopy 10 15 Fryer J R and Holland F M 1984 Pmc. R. Soc. A 393 352 P 1980 Ulframicroscopy 5 195 Kobayashi T and Reimer L 1975 Bull. Inst. Chem. Res. Kyoto Univ. 53 105 Siegle G 1972 Nalu?farschwzg a 27 325 lntemational Study Group 1986 J. Microsc. 141 385 Salih S M and Cossletl V E 1975 J, Micmsc. 105 269 Salih S M and Cossletl V E 1974 Phil. Mag. 30 225 Fryer J R 1987 Ulframicroscopy 23 321 Vesely D and Downing K H 1990 Elecrmn Crystallography of Organic Molecules ed J RFryer and D L Dorset (Dordrecht: Kluwer) p 361 145 139 269 J. Appl. Phys. 48 3900 Dorset D L and Turner J N 1976 Narunvissenschnflen 63 Henderson R and Glaeser R M 1985 Ultramicroscopy 16 Downing K H and Glaeser R M 1986 Ultramicroscopy 20 Vincett P S , Barlow W A and Roberts G G 1977 Fryer J R and Ewins C 1992 Phil. Mag. A 66 889 Debe M K 1982 J. Vac. Sci. Technol. 21 74 Fan P L. Larson D C and L a b s M M 1972 Thin Solid Fi(mS.12 s3-7 Donaldson D M. Robertson J M and White J G 1953

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