INDEX. 



ABACUS, logical, 104 ; arithmetical, 

 107 ; Panchrestus, 183. 



Aberration of light, 561 ; syste- 

 matic, 547. 



Abscissio infiniti, 79, 713. 



Abstract terms, 27 ; number, 159. 



Abstraction, 704 ; logical, 25 ; nu- 

 merical, 158 ; of indifferent cir- 

 cumstances, 97. 



Accademia del Cimento, 427, 432, 

 436, 527. 



Accident, logical, 700. 



Accidental discovery, 529. 



Achromatic lenses, 432. 



Actinometer, 337. 



Adamantine medium, 605, 751. 



Adjectives, 14, 30, 31, 35; inde- 

 terminate, 41. 



Adrain, of New Brunswick, 375. 



Affirmation, 44. 



Agassiz, on genera, 726 ; on crea- 

 tion of species, 763. 



Agreement, 44. 



'iry,~ Sir George Biddell, on per- 

 petual motion, 223 ; new property 

 of sphere, 232 ; pendulum experi- 

 ments, 291, 304, 348, 567 ; stan- 

 dard clock, 353 ; book on Errors 

 of Observation, 395 ; tides, 488 ; 

 extra-polation, 495 ; Thales' 

 eclipse, 537 ; interference of 

 light, 539 ; density of earth, 291. 



Alchemists, 505 ; how misled, 428. 



Algebra, 123, 155, 164; Diophan- 

 tine, 631. 



Algebraic, equations, 123 ; geo- 

 metry, 633. 



Allotropic state, 663, 670. 



Alloys, possible number, 191 ; pro. 

 perties, 528. 



Alphabet, the Logical, 93, 104, 125 ; 

 Morse, 193. 



Alphabet, permutations of letters of 

 the, 174, 179. 



Alphabetic indexes, 714. 



Alternative relations, 67 ; exclusive 

 and unexclusive, 205. 



Ampere, electricity, 547 ; classifi- 

 cation, 679. 



Anagrams, 128. 



Analogy, 627 ; of logical and nume- 

 rical terms, 160 ; and generali- 

 sation, 596 ; in mathematical 

 sciences, 631 ; in theory of undu- 

 lations, 635 ; in astronomy, 638 ; 

 failure of, 641. 



Analysis, logical, 122. 



Andrews, Prof. Thomas, experiments 

 on gaseous state, 71, 613, 665, 

 753. 



Angstrom, on spectrum, 424. 



Angular magnitude, 305, 306, 326. 



Antecedent denned, 225. 



Anticipation of Nature, 509. 



Anticipations, of Principle of Sub- 

 stitution, 21 ; of electric tele- 

 graph, 671. 



Apparent, equality, 275; sequmco 

 of events, 409. 



Approximation, theory of, 456 ; tn 

 exact laws, 462 ; mathematical 

 principles of, 471 ; arithmetic of, 

 481. 



Aqueous vapour, 50. 



Aquinas, on disjunctive propo<?- 

 tions, 69. 



3 D 2 



