Microscopicalinstrumentation and techniques developed in response to the needs of a specific science, or for study of specific materials, can often be adapted with little or no modification to the requirements of another science, or for study of different materials. This fact, coupled with the ubiquitous nature of the microscope, results in a wide scattering throughout the scientific literature of information of possible use to analysts. Regrettably, it has not been possible exhaustively to survey the available literature for items of analytical interest.(57) has discussed some recent develop-