  It is also the case that in some biologically actual circumstances—for example, in circumstances in which mean fitnesses are low, increased variance is sometimes selected for (Ekbohm, Fagerstrom, and Agren 1979). As Beatty and Finsen (1987) further showed, our “definition” will also have to accommodate “skew” along with offspring numbers and variance. Skew “appears” when one of the “tails” of the distribution contains more observations and the median is therefore shifted away from the normal. Our “definition” of fitness must take these conditions into account on pain of falsity. One simple way to do so is to add a ceteris paribus clause to the definition. But the question must then be raised of how many different exceptions to the original definiens need to be accommodated.  If the circumstances under which greater offspring numbers do not make for greater fitness are indefinitely many, then this “definition” will be unsatisfactory.