By microscopic examination the presence of constituents of animal origin can be established; whereas bones of terrestrial animals and bones of fish can be distinguished by microscopic examination; whereas the possibility of distinguishing, by microscopic examination, the bones of mammalian origin from bones of poultry origin depends on the experience of the analyst; ... whereas it may be appropriate according to the progress of scientific and technological knowledge, to combine microscopic examination with other methods of analysis; whereas the fixing of these guidelines for the microscopic examination do not exclude the use, instead or in addition, of methods of analysis, other than microscopic examination, which have been proved to be scientifically valid ...
