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I still regard this idea as correct, but I attribute less importance to "organic selection" than I did at that time, in so far that I do not believe that it _alone_ could effect complex harmonious adaptations. Germinal selection now seems to me to play the chief part in bringing about such adaptations. Something the same is true of the principle I have called _Panmixia_. As I became more and more convinced, in the course of years, that the _Lamarckian principle_ ought not to be called in to explain the dwindling of disused parts, I believed that this process might be simply explained as due to the cessation of the conservative effect of natural selection. I said to myself that, from the moment in which a part ceases to be of use, natural selection withdraws its hand from it, and then it must inevitably fall from the height of its adaptiveness, because inferior variants would have as good a chance of persisting as better ones, since all grades of fitness of the part in question would be mingled with one another indiscriminately. This is undoubtedly true, as Romanes pointed out ten years before I did, and this mingling of the bad with the good probably does bring about a deterioration of the part concerned. But it cannot account for the steady diminution, which always occurs when a part is in process of becoming rudimentary, and which goes on until it ultimately disappears altogether. The process of dwindling cannot therefore be explained as due to panmixia alone: we can only find a sufficient explanation in germinal selection.

Rome was at this time, as we have said, the great center of education, as well as of religious and ecclesiastical influence. In fact, education and religion went hand in hand in those days, there being scarcely any instruction in books excepting for the purposes of the Church. Separate schools had been established at Rome by the leading nations of Europe, where their youth could be taught, each at an institution in which his own language was spoken. Ethelwolf remained a year at Rome, to give Alfred the benefit of the advantages which the city afforded. The boy was of a reflective and thoughtful turn of mind, and applied himself diligently to the performance of his duties. His mind was rapidly expanded, his powers were developed, and stores of such knowledge as was adapted to the circumstances and wants of the times were laid up. The religious and intellectual influences thus brought to bear upon the young Alfred's mind produced strong and decided effects in the formation of his character--effects which were very strikingly visible in his subsequent career.

In the design of the Babcock & Wilcox boiler sufficient space is provided between the steam outlet and the disengaging point to insure the steam passing from the boiler in a dry state without entraining or again picking up any particles of water in its passage even at high rates of evaporation. Ample time is given for a complete separation of steam from the water at the disengaging surface before the steam is carried from the boiler. These two features, which are additional causes for the ability of the Babcock & Wilcox boiler to deliver dry steam, result from the proper proportioning of the steam and water space of the boiler. From the history of the development of the boiler, it is evident that the cubical capacity per horse power of the steam and water space has been adopted after numerous experiments.

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