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12111 MORGAN (Augustus de ; F.R.A.S., Prof. Mathematics, Univ. College, Lond.) On the GENERAL 

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12H2 On the GENERAL PRINCIPLES of which the COMPOSITION or AGGREGATION of FORCES 



is a CONSEQUENCE, 4to. (pp. 17), sewn, 3s ib., 1859 



12H3 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 

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12H4 LETTER to the PRESIDENT, on the FOUNDATION of the [ASTRONOMICAL] SOCIETY, 8vo. 



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NEWTON : his Friend and his Niece (1885) v. NEWTONIANA, post. 



On a POINT connected with the DISPUTE between KEIL and LEIBNITZ about the INVEN- 

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12115 RECURRENCE of ECLIPSES and FULL MOONS, 12mo. (pp. 3), unbound, Is [1846] 



12116 REFERENCES for the HISTORY of the MATHEMATICAL SCIENCES, 12mo. (pp.26), unbound, 



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12117 SHORT ACCOUNT pf some RECENT DISCOVERIES in England and Germany relative to the 



Controversy on the INVENTION of FLUXIONS, 12mo. (pp. 16), unbound, 2s [1851] 



12118 SHORT SUPPLEMENTARY REMARKS on the FIRST Six BOOKS of EUCLID'S ELEMENTS, 



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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 



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His answer to a charge of ' breach of confidence ' 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 



PROBABILITIES to Questions of ARGUMENT and AUTHORITY, 4to. (pp. 30), sewn, with author's 

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

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12122 On the STUDY and DIFFICULTIES of MATHEMATICS, 8vo. (pp. 96), sewn (no title), 



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12123 ANOTHER COPY, with EXAMPLES of the PROCESSES of ARITHMETIC and ALGEBRA, 



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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, 4s ib., 1860 



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



4s 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 



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Forming No. II of the Syllogism Series. 



12128 A THEOREM relating to NEUTRAL SERIES, 4to. (pp. 13), sewn, with auto, of John 



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12129 THEORY of PROBABILITIES (Encyclopaedia Metropolitana), 4to. (pp. 98), unbound, 



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12131 TRIGONOMETRY and DOUBLE ALGEBRA, with front, and diagrams, 8vo. cl. (SCARCE), 



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

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

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12132 On the USE of SMALL TABLES of LOGARITHMS in COMMERCIAL CALCULATIONS, and on 



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12133 , MEMOIR of, by his Wife SOPHIA ELIZABETH, with select LETTERS, autotype portrait, 



8vo. cl. (o. p.), 8s Qd 1882 

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12134 MORGAN (Major F. C.) HANDBOOK of ARTILLERY MATERIEL, 5th Edition, with 23 plates 

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12135 MORGAN-BROWN (William), LETTERS PATENT to, for the INVENTION of ' IMPROVEMENTS 

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The patent specification of the invention of Graham Bell's magneto-telephono." 



12136 MOROZZI (Fernando) Dello STATO ANTICO e MODERNO del FIUME ARNO, e delle Cause e 

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