LIST OF WRITINGS. 403 



(13) Method of Integrating Partial Differential Equations, read 



June 1848. 



(14) On the Symbols of Logic, the Theory of the Syllogism, and 



in particular of the Copula, and the application of the 

 Theory of Probability to some questions of Evidence, 

 read Feb. 1850. 



(15) On some Points of the Integral Calculns, read Feb. 1851. 



(16) On some Points in the Theory of Differential Equations, 



read 1854. 



(17) On the Singular Points of Curves, and on Newton's Theory 



of Co-ordinated Exponents, read 1855. 



(18) On the Question : What is the Solution of a Differential 



Equation, Supplement to No. 3, read April 1856. 



(19) On the Beats of Imperfect Consonances, read Nov. 1857. 



(20) A Proof of the Existence of a Root in every Algebraic 



Equation, read Dec. 1857. 



(21) On the General Principles of which the Composition or 



Aggregation of Forces is a Consequence, read 1859. 



(22) On the Syllogism, No. 4, and on the Logic of Relations, 



read 1860. 



(23) On the Theory of Errors of Observation, read Nov. 1861. 



(24) On the Syllogism, No. 5, and on various points of the 



Onymatic System, read 1863. 



(25) On the Early History of the Signs + and , read 1864. 



(26) A Theorem relating to Neutral Series, read 1864. 



(27) On Infinity and the Sign of Equality, read May 1864. 



(28) On the Root of any Function, and on Neutral Series, No. 2, 



read May 1866. 



(29) On a Theorem relating to Neutral Series, read Oct. 1868. 



IN THE PHILOSOPHICAL MAGAZINE. 



(1) On Taylor's Theorem, 1835. 



(2) On the Relative Signs of Co-ordinates, 1836. 



(3) On the Solid Polyhedron, 1838. 



(4) On the Rule for finding the value of an Annuity for three 



lives, 1839. 



(5) Suggestion on Barrett's Method, 1841. 



(6) On Ferncl's Measure of a Degree, Nos. 1 and 2, 1841. 



(7) On the reduction of a Continued Fraction to a Series, 1841. 



(8) On Fernel's Measure of a Degree, Nos. 3 and 4, 1842, 



(9) On Leonardo da Vinci's Use of + and -, 1842. 



(10) On Torpor-ley's Anticipation of part of Napier's Rule, 1843. 



n D 2 



