An attack on the Newtonian mechanics; revolution by gravitation demonstrably impossible; much to be said for the earth being the immovable center. A good analysis of contents at the beginning, a thing seldom found. The author has followed up his attack in a paper submitted to the British Association, but which it appears the Association declined to consider. It is entitled-- _Victoria Toto Coelo_; or, Modern Astronomy recast. London, 1863, 8vo. At the end is a criticism of Sir G. Lewis's _History of Ancient Astronomy_. On the definition and nature of the Science of Political Economy. By H. Dunning Macleod,[319] Esq. Cambridge, 1862, 8vo. A paper read--but, according to the report, not understood--at the British Association. There is a notion that political economy is entirely mathematical; and its negative quantity is strongly recommended for study: it contains "the whole of the Funds, Credit, 32 parts out of 33 of the value of Land...." The mathematics are described as consisting of--first, number, or Arithmetic; secondly, the theory of dependent quantities, subdivided into dependence by cause and effect, and dependence by simultaneous variations; thirdly, "independent quantities or unconnected events, which is the theory of probabilities." I am not ashamed, having the British Association as a co-non-intelligent, to say I do not understand this: there is a paradox in it, and the author should give further explanation, especially of his negative quantity. Mr. Macleod has gained {185} praise from great names for his political economy; but this, I suspect, must have been for other parts of his system. On the principles and practice of just Intonation, with a view to the abolition of temperament.... By General Perronet Thompson.[320] Sixth Edition. London, 1862, 8vo. Here is General Thompson again, with another paradox: but always master of the subject, always well up in what his predecessors have done, and always aiming at a useful end. He desires to abolish temperament by additional keys, and has constructed an enharmonic organ with forty sounds in the octave. If this can be introduced, I, for one, shall delight to hear it: but there are very great difficulties in the way, greater than stood even in the way of the repeal of the bread-tax.