Part 1 of Essay
the relative importance of genetic and environmental factors in the aetiology of schizophrenia. Graeme Gordon ...poor Ophelia, divided from herself and her fair judgement without the which we arepictures or mere beasts... Shakespeare, Hamlet ....

Part 2 of Essay
.... medical costs, lost productivity and Social Security pensions is between $30 billion and $48 billion according to Federal figures (American Pychological Association (APA), 1996). There are many theories about the aetiology of schizophrenia, but research has failed to pinpoint the origins. There is evidence that environmental pathogens (for example, viruses) are involved in the causation of schizophrenia. There is also evidence for a role of hereditary influences and obstetric complications on the inciden ....