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A piece of music, again, without any words at all, or a song with words that have nothing in the world to do with the ideas which it is nevertheless made to convey, is often very effectual language. Much lying, and all irony depends on tampering with covenanted symbols, and making those that are usually associated with one set of ideas convey by a sleight of mind others of a different nature. That is why irony is intolerably fatiguing unless very sparingly used. Take the song which Blondel sang under the window of King Richard's prison. There was not one syllable in it to say that Blondel was there, and was going to help the king to get out of prison. It was about some silly love affair, but it was a letter all the same, and the king made language of what would otherwise have been no language, by guessing the meaning, that is to say by perceiving that he was expected to enter then and there into a new covenant as to the meaning of the symbols that were presented to him, understanding what this covenant was to be, and acquiescing in it.

In 1690, Papin suggested that the condensation of steam should be employed to make a vacuum beneath a cylinder which had previously been raised by the expansion of steam. This was the earliest cylinder and piston steam engine and his plan took practical shape in Newcomen's atmospheric engine. Papin's first engine was unworkable owing to the fact that he used the same vessel for both boiler and cylinder. A small quantity of water was placed in the bottom of the vessel and heat was applied. When steam formed and raised the piston, the heat was withdrawn and the piston did work on its down stroke under pressure of the atmosphere. After hearing of Savery's engine, Papin developed an improved form. Papin's engine of 1705 consisted of a displacement chamber in which a floating diaphragm or piston on top of the water kept the steam and water from direct contact. The water delivered by the downward movement of the piston under pressure, to a closed tank, flowed in a continuous stream against the vanes of a water wheel. When the steam in the displacement chamber had expanded, it was exhausted to the atmosphere through a valve instead of being condensed. The engine was, in fact, a non-condensing, single action steam pump with the steam and pump cylinders in one. A curious feature of this engine was a heater placed in the diaphragm. This was a mass of heated metal for the purpose of keeping the steam dry or preventing condensation during expansion. This device might be called the first superheater.

As I have here to deal only with the theory of selection, I need not discuss the Lamarckian hypothesis, but I must express my opinion that there is room for much doubt as to the cooeperation of this principle in evolution. Not only is it difficult to imagine how the transmission of functional modifications could take place, but, up to the present time, notwithstanding the endeavours of many excellent investigators, not a single actual proof of such inheritance has been brought forward. Semon's experiments on plants are, according to the botanist Pfeffer, not to be relied on, and even the recent, beautiful experiments made by Dr. Kammerer on salamanders, cannot, as I hope to show elsewhere, be regarded as proof, if only because they do not deal at all with functional modifications, that is, with modifications brought about by use, and it is to these _alone_ that the Lamarckian principle refers.

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