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John did not return to England until near the middle of December, but even at that date Innocent III had not decided the question of the Canterbury election. On December 20 he declared against the claim of the bishops and against the first secret election by the monks, and under his influence the deputation from Canterbury elected an Englishman and cardinal highly respected at Rome both for his character and for his learning, Stephen of Langton. The representatives of the king at Rome refused to agree to this election, and the pope himself wrote to John urging him to accept the new archbishop, but taking care to make it clear that the consent of the king was not essential, and indeed he did not wait for it. After correspondence with John in which the king's anger and his refusal to accept Langton were plainly expressed, on June 17, 1207, he consecrated Stephen archbishop. John's answer was the confiscation of the lands of the whole archbishopric, apparently those of the convent as well as those of the archbishop, and the expulsion of the monks from the country as traitors, while the trial in England of all appeals to the pope was forbidden.

In animals like sea-anemones and jellyfishes the general symmetry of the body is radial; that is to say, there is no right or left, and the body might be halved along many planes. It is a kind of symmetry well suited for sedentary or for drifting life. But worms began the profitable habit of moving with one end of the body always in front, and from worms to man the great majority of animals have bilateral symmetry. They have a right and a left side, and there is only one cut that halves the body. This kind of symmetry is suited for a more strenuous life than radial animals show; it is suited for pursuing food, for avoiding enemies, for chasing mates. And _with the establishment of bilateral symmetry must be associated the establishment of head-brains_, the beginning of which is to be found in some simple worm-types.

The improvement in boiler and engine design of Smeaton, Newcomen and their contemporaries, were followed by those of the great engineer, James Watt, an instrument maker of Glasgow. In 1763, while repairing a model of Newcomen's engine, he was impressed by the great waste of steam to which the alternating cooling and heating of the engine gave rise. His remedy was the maintaining of the cylinder as hot as the entering steam and with this in view he added a vessel separate from the cylinder, into which the steam should pass from the cylinder and be there condensed either by the application of cold water outside or by a jet from within. To preserve a vacuum in his condenser, he added an air pump which should serve to remove the water of condensation and air brought in with the injection water or due to leakage. As the cylinder no longer acted as a condenser, he could maintain it at a high temperature by covering it with non-conducting material and, in particular, by the use of a steam jacket. Further and with the same object in view, he covered the top of the cylinder and introduced steam above the piston to do the work previously accomplished by atmospheric pressure. After several trials with an experimental apparatus based on these ideas, Watt patented his improvements in 1769. Aside from their historical importance, Watt's improvements, as described in his specification, are to this day a statement of the principles which guide the scientific development of the steam engine. His words are:

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