"In reference to the willow and the streams of Babylon, where the Hebrews remembered Zion so mournfully, Sir Robert Ker Porter states, that 'the banks of the Euphrates were hoary with reeds, and the grey osier willows were yet there on which the captives of Israel hung their harps,' and wept in the land of the stranger. The _salix babylonica_, or the weeping willow, in its geographical range, sweeps through the plains of Judea, and by the ruins of Babylon, from the verge of the Mediterranean to the frontiers of Japan--a lovely line of beauty--the Niobe of vegetation! Sad memorial of the mournful march of the captive Hebrews. It is, we think, a very striking circumstance, that these countries should even now retain such unchanged lineaments of their ancient history. Time seems to linger, or move slowly on; as if the wheels of nature stood still, and paused at the mournful sight of departed grandeur and buried magnificence--BABYLON in ruins! 'MENE!--GOD hath numbered thy kingdom, and finished it!' Mr. Rich has given us a sketch of a spade copied from a Babylonian brick found near El Kasr, and detached from a mass of ruin, in all probability, on the very site of Nebuchadnezzar's pensile gardens; and he remarks, that it is almost a fac simile of the spade used at this very day in Chaldea." * * * * * SPIRIT OF DISCOVERY. * * * * * _Heating with Hot Water._ Mr. A.M. Perkins has communicated to the _Gardeners' Magazine_ the details of his plan for heating hot-houses by the circulation of hot water in hermetically sealed tubes of small diameter. Upon the economy of the plan, Mr. Loudon observes:--"With respect to the power of the one-inch tubes, it has been demonstrated by a mathematician and chemist of the very first authority, that as much will be effected by one of Mr. Perkins's one-inch tubes, heated to 300° as by one of the three-inch tubes, employed in any of the ordinary modes of heating by hot water when heated to 180°." A second advantage of Mr. Perkins's mode for hot-houses, is the small space which the pipes occupy. A third advantage is, that the water may be circulated without regard to whether the tubes are below or above the level of the fire-place. "But, however favourable this plan may be for heating hot-houses, the advantage for that class of structures are as nothing compared to those which it offers for heating _dwelling-houses_ and all kinds of _manufactories_. This will be understood at once, when it is stated that the water may be circulated under ordinary circumstances of attention to the fire, at from 300° to 600°; and, with extraordinary strength of pipe, and application of fuel to a still higher degree. It is found that 400° will roast meat. The workmen in the bank-note printing-office of Messrs. Perkins and Bacon have dressed a beefsteak at the further extremity of the pipe of hot water used for heating the steel plates; and Mr. Perkins is constructing