The Latin verb discurrere meant "to run about", and from this word we get our word discursive , which often means rambling about over a wide range of topics. A discursive writing style generally isn't encouraged by writing teachers. But some of the great 19th-century writers, such as Charles Lamb and Thomas de Quincey, show that the discursive essay, especially when gracefully written and somewhat personal in tone, can be a pleasure to read. And the man often called the inventor of the essay, the great Michel de Montaigne, might touch on dozens of different topics in the course of a long discursive essay.
8 Although I accept that some drugs can be used on animals and humans, this does not mean that they have to be tested on animals in the first place when alternative methods are available. Alternative methods do work. Various groups have been set up to put money into other ways of researching. For example the Dr. Hadwen Trust has shown how human cartilage can be grown in test tubes to study rheumatism. Similar research is being done into cancer and multiple sclerosis. Tests can be done on bacteria to see whether a chemical will cause cancer. There is even a programme of volunteer human researchers, where people suffering from illnesses offer to help in research.