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The steam engine first became commercially successful with Thomas Savery. In 1699, Savery exhibited before the Royal Society of England (Sir Isaac Newton was President at the time), a model engine which consisted of two copper receivers alternately connected by a three-way hand-operated valve, with a boiler and a source of water supply. When the water in one receiver had been driven out by the steam, cold water was poured over its outside surface, creating a vacuum through condensation and causing it to fill again while the water in the other reservoir was being forced out. A number of machines were built on this principle and placed in actual use as mine pumps. The serious difficulty encountered in the use of Savery's engine was the fact that the height to which it could lift water was limited by the pressure the boiler and vessels could bear. Before Savery's engine was entirely displaced by its successor, Newcomen's, it was considerably improved by Desaguliers, who applied the Papin safety valve to the boiler and substituted condensation by a jet within the vessel for Savery's surface condensation.

The Surinam toad, represented in No. 8, is also the possessor of one of the strangest nurseries known to science. It lives in the dense tropical forests of Guiana and Brazil, and is a true water-haunter. But at the breeding season the female undergoes a curious change of integument. The skin on her back grows pulpy, soft, and jelly-like. She lays her eggs in the water: but as soon as she has laid them, her lord and master plasters them on to her impressionable back with his feet, so as to secure them from all assaults of enemies. Every egg is pressed separately into a bed of the soft skin, which soon closes over it automatically, thus burying each in a little cell or niche, where it undergoes its further development. The tadpoles pass through their larval stage within the cell, and then hop out, in the four-legged condition. As soon as they have gone off to shift for themselves, the mother toad finds herself with a ragged and honeycombed skin, which must be very uncomfortable. So she rubs the remnant of it off against stones or the bark of trees, and re-develops a similar back afresh at the next breeding season.

It has already been suggested that the reigns of Richard and John form a period of transition to a new age. That period closes and the new age opens with the granting of the Great Charter and the attempted revolution which followed. The reign of John was the culmination of a long tendency in English history, most rapid since the accession of his father, towards the establishment of an absolutism in which the rights of all classes would disappear and the arbitrary will of the king be supreme. The story of his reign should reveal how very near that result was of accomplishment. A monarchy had been forming in the last three reigns, and very rapidly in the reign of John, capable of crushing any ordinary opposition, disregarding public opinion and traditional rights, possessing in the new judicial system, if regarded as an organ of the king's will alone, an engine of centralization, punishment, and extortion, of irresistible force, and developing rapidly in financial matters complete independence of all controlling principles. Though the barons were acting rather from personal and selfish motives, freedom for all classes depended on the speedy checking of this steady drift of two generations. The reigns of Richard and John may be called transitional because it is in them that the barons came to see clearly the principles on which successful resistance could be founded and the absolutist tendency checked. The embodiment of these principles in permanent form in the Great Charter to be accepted by the sovereign and enforced in practice, introduces an age, the age of constitutional growth, new in the history of England, and in the form and importance of its results new in the history of the world.

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