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602 Nature Vol. 293 22 October 1981 CORRESPONDENCE If Dr Pearson wishes to dispute the general then used to compute the reading ease of the Ethics for animals applicability of natural selection he should passage (RE) from the equation: StR- As noted in your editorial (Nature 17 probably begin by attacking the ubiquity of RE = 206.835 -0.846wl-1.015sl September, p.173), human research is already these conditions in nature. I that it is controlled by ethics committees, and so we safe to say, however, that he will not meet Flesch produced a classification of RE which have some experience that can predict the with much success. is summarized in Table 1. We have chosen effects of introducing their non-human ROBERT P. GENDRON every twentieth letter published in Nature from counterparts. Duke University 1930, at ten-year intervals, to 1980 and An ethics committee that takes itself Durham, North Carolina, USA calculated RE for the first hundred words in seriously is a major obstacle to a research each. The first hundred were chosen in the worker. By the nature of things, its members that here the authors should be writing are senior, having their own productive Gold solution most clearly, attempting to explain the research days well behind them. The SIR- Your editorial on returning to the gold purpose of their work and its significance to supplicant is called upon to justify his standard (Nature 24 September, p.246) the general reader. Choosing the beginning proposition in advance of the evidence, so the showed an amazing degree of understanding rather than any other part also reduced the more original "look-see" type of work is of the topic. Gold has been a monetary chance of encountering complex formulae and discouraged. In arguing a nice point of logic, standard primarily because almost all that equations which do not readily lend themselves the committee is both cross-examining counsel has been mined in the past several thousand toRE calculations. Our results are shown in and judge. Research workers have many years is still around in a readily available Table 2. possible deadlines to meet, and delay imposed form. Mining at full tilt can scarcely make a It can be seen that there is a sharp drop in by waiting for one or maybe more meetings ripple in this huge, widely distributed bulk and RE when 1950 is compared with 1940. The may give the lead to other workers or cause an the major commercial uses of gold do not Student t-test shows this to be highly intending financial sponsor to take his grant destroy its availability, so that the supply is significant (P

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