I have read the observations of Dr R. A. Houstoun at the top of p. 164 of the current volume of these Proceedings, and I gather the impression that he has been dissuaded by general beliefs of what cannot be done from using the simplest of all possible methods. Forty-five years ago when I required a very high speed of rotation I completely ignored or defied these general beliefs with the greatest success, and it seems to me to be possible that a few words on my practice might be useful. If this is the case I should feel that as a newly appointed Hon. Fellow of the Royal Society of Edinburgh I had at least done what I could in recognition of that honour.