HENRY SOTHERAN & CO., 140, STRAND, W.C, and 43, PICCADILLY, W. 603 



12111 MORGAN (Augustus de ; f.r.a.s., Prof. Mathematics, Univ. College, Lond.) On the General 

 Equation of Curves of the Second Degree, 4to. (pp. 8), sewn, with author's inscr. to Dionysius 

 Lardner^ pr., LL.D., F.R.S., 3* Cambridge, 1831 



121 12 On the General Principles of which the Composition or Aggregation of Forces 



is a Consequence, 4to. (pp. 17), sewn, Zs ib., 1859 



12113 On Infinity; and on the Sign of Equality, 4to. (pp. 45), sewn, 4s ib., 1865 



' I cannot imagine, said a good mathematician, what people mean by writing about first principles ; it seems to me 

 like poking into nothing : I have no doubt he truly described nis own state.'— p. 2, 



12114 Letter to the President, on the Foundation of the [Astronomical] Society, 8vo. 



(pp. 2), sewn, \s n. d. 



Newton : his Friend and his Niece (1885)— v. Newtonian A, post. 



On a Point connected with the Dispute between Keil and Leibnitz about the Inven- 

 tion of Fluxions (1846)— v. Newtonian a, post. 



12115 Recurrence of Eclipses and Full Moons, 12mo. (pp. 3), unbound, \s [1846] 



12116 References for the History of the Mathematical Sciences, 12mo. (pp.26), unbound, 



2s [1842] 



12117 Short Account of some Recent Discoveries in England and Germany relative to the 



Controversy on the Invention of Fluxions, 12nio. (pp. 16), unbound, 2s [1851] 



12118 Short Supplementary Remarks on the First Six Books of Euclid's Elements, 



12mo. (pp. 12), unbound, Is 6d [1848] 



12119 On Some Points in the History of Arithmetic, 12mo. (pp. 18), unbound, 2s [1850] 



12120 Statement in Answer to an Assertion made by Sir William Hamilton, Prof, of 



Logic, Univ. Edin., 8vo. (pp. 16), setcn, 2s 6d [1847] 



His answer to a charge of ' breach of confidetice ' and * false dealing ' in appropriating Sir William Hamilton's ideas on logic. 



12121 On the Structure of the Syllogism, and on the Application of the Theory of 



Probaijilities to Questions of Argument and Authority, 4to. (pp. 30), sewn, with author's 

 inscr. to John Hoppus, F.R.S. {scarce), \0s 6d Cambridge, 1847 



This tract, which formed No. I of the Series on Syllogism, together with his work on Formal Logic, started the famous 

 controversy with Sir William Hamilton on the latter's doctrine of the quantification of the predicate. 



12122 On the Study and Difficulties of Mathematics, 8vo. (pp. 96), sewn {no title), 



2s 6rf [1831] 



12123 Another Copy, with Examples of the Processes of Arithmetic and Algebra, 



2 vols. 8vo. in 1, boards, 3s 6rf [1832] 



12124 On the Syllogism, No. Ill, and on Logic in General, 4to. (pp. 60), sewn, 5s 



Cambridge, 1858 



12125 , No. IV, and on the Logic of Relations, 4to. (pp. 32), sewn, is ib., 1860 



12126 , No. V, and on the various Points of the Onymatic System, 4to. (pp. 60), sewn, 



45 ib., 1863 



The last paper published of the series. No. I is entitled 'On the Structure of Syllogism' (No. 12121), and No. II ' On 



the Symbols of Logic ' (No. 12127). 



12127 On the Symbols of Logic, the Theory of the Syllogism, and in particular of the 



Copula, and the Application of the Theory of Probabilities to some Questions of Evidence, 4to- 

 (pp. 51), sewn^ 5s ib., 1850 



Forming No. II of the Syllogism Series. 



12128 A Theorem relating to Neutral Series, 4to. (pp. 13), seiow, with auto, of John 



Hoppus, F.E.S., 2s ib., 1865 



12129 Theory of Probabilities (Encyclopaedia Metropolitana), 4to. (pp. 98), unbound, 



4s [1836] 



12130 Another Copy, hf. cL, As 6rf 



12131 Trigonometry and Double Algebra, with front, and diagrams, 8vo. cl. (scarce), 



125 6rf 1849 



' His ' double algebra ' was the forerunner of quaternions, and contained the complete geometrical interpretation of 

 V- 1 '• — R.A.S. Monthly Notices. Sir W. R. Hamilton acknowledged the suggestions he received from the above work in 

 inventing Quaternions in his Lectures on Quaternions (q. v. ante). 



' Double algebra means algebra in which each symbol stands for an object of thought having two distinct and inde- 

 pendent qualities'.— Pre/ace. 



12132 On the Use of Small Tables of Logarithms in Commercial Calculations, and on 



the Practicability of a Decimal Coinage, 12mo. (pp. 17), unbound, Is 6d [1840] 



12133 , Memoir of, by his Wife Sophia Elizabeth, with select Letters, autotype portrait^ 



8vo. cl. {o. p.), 8s 6d 1882 

 Not only of great interest as a biography, but valuable for the author's interesting correspondence with Sir William 

 Hamilton, Sir John Herschel, Dean Peacock, John Stuart Mill, Admiral Smyth, Dr. Whewell, and many others. 

 V. Nos. 10796-7, ante. 



12134 MOBG-AN (Major F. C.) Handbook of Artillery Materiel, 5th Edition, with 23 plates 

 and 4 folding tables (linen-mounted), 12rao. hf. morocco, 2s 6d 1892 



12135 MOKGAN-BBOWN (William), Letters Patent to, for the Invention of * Improvements 

 in Electric Telephony (Transmitting or Causing Sounds for Telegraphing Messages) and 

 Telephonic Apparatus ' : a Communication from abroad by Alexander Graham BELL,'wt<A 

 5 plates (4 folding), impl. 8vo. (pp. 21), sewn {scarce), 6s Qd 1877 



The patent specification of the invention of Graham Bell's magneto-telephonr?.' 



12136 MOBOZZI (Fernando) Dello Stato Antico e MoDERNO'del Fiume Arno, e delle Cause e 

 de' Rimedi delle sue Inondazioni : Ragionamento Istorico Mattematico ; with 2 plates {\ folding), 

 other engravings, and folding plan of Florence, 2 vols. 4to. in 1, old white vellum {fine copy) ; with 

 booklabel of George Bennies F.R.S., 8s 6d Firenze, 1762-6 



