404 MEMOIR OF AUGUSTUS DE MORGAN. 



(11) On the almost total disappearance of the earliest Trigono- 



metrical Canon, 1845. 



(12) Derivation of the word Theodolite, 1846. 



(13) Derivation of Tangent and Secant, 1846. 



(14) Account of the Speculations of Thos. Wright, of Durham, 



1848. 



(15) On the Additions made to the Second Edition of the Com- 



mercium Epistolicum, 1848. 



(16) On a Property of the Hyperbola, Jan. 1848. 



(17) On Anharmonic Ratio, 1849. 



(18) On the Early History of Infinitesimals in England, 1, 1852. 



(19) On Indirect Demonstration, 1852. 



(20) On the Authorship of the Account of the Commercium 



Epistolicum, 1852. 



CAMBRIDGE MATHEMATICAL JOURNAL. 



(1) On the Perspective of the Co-ordinate Plane, pp. 92, 93, 



1841. 



(2) On a simple property of the Conic Section, pp. 201-3, 1841. 



(3) Remarks on the Binomial Theorem, pp. 61, 62, 1843. 



(4) On the Equation (D + a) n 3 = a;, pp. 60-62, 1845. 



(5) On a Law existing in the successive approximations of a 



Continuous Fraction, pp. 97-99, 1845. 



CAMBRIDGE AND DUBLIN MATHEMATICAL JOURNAL. 



(1) On Arbogast's Formulae of Expansion, pp. 238-255, 1846. 



(2) Suggestion on the Integration of Rational Fractions, Nov. 



1848. 



(3) On a Point in the Solution of Linear Differential Equa- 



tions, 1849. 



(4) Extension of the word Area, May 1850. 



(5) Application of Combinations to the explanation of Arbogast's 



Method, Feb. 1851. 



(6) On the Mode of using the signs + and in Plane Trigo- 



nometry, May 1 851 . 



(7) On the Connection of Involute and Evolute in Space, Nov. 



1851. 



(8) On Partial Differential Equations of the First Order, Feb. 



1852. 



(9) On the Signs + and in Geometry, and on the interpre- 



tation of the Equation of a Curve, Nov. 1852. 

 (10) Mathematical Notes, pp. 93, 94, 1853. 



