8. Such variations in size， shape，chemistry， conduction speed， excitation threshold，and the like as had been demonstrated in nerve cells remained negligible in significance for any possible correlation with the manifold dimensions of mental experience.？？
9.Although qualitative variance among nerve energies was never rigidly disproved，the doctrine was generally abandoned in favor of the opposing view，namely，that nerve impulses are essentially homogeneous in quality and are transmitted as “common currency” throughout the nervous system. Other experiments revealed slight variations in the size，number， arrangement，and interconnection of the nerve cells，but as far as psychoneural correlations were concerned，the obvious similarities of these sensory fields to each other seemed much more remarkable than any of the minute differences. Although some experiments show that，as an object becomes familiar，its internal representation becomes more holistic and the recognition process correspondingly more parallel，the weight of evidence seems to support the serial hypothesis， at least for objects that are not notably simple and familiar.
10.In large part as a consequence of the feminist movement，historians have focused a great deal of attention in recent years on determining more accurately the status of women in various periods.
11.Thus，for instance，it may come as a shock to mathematicians to learn that the Schrodinger equation for the hydrogen atom is not a literally correct description of this atom，but only an approximation to a somewhat more correct equation taking account of spin，magnetic dipole，and relativistic effects；and that this corrected equation is itself only an imperfect approximation to an infinite set of quantum field-theoretical equations.