INDEX. 



Abacus, logical, 104 ; arithmetical, 

 107 ; Paiichrc!itus, 182. 



Aberration of light, 561 ; syste- 

 matic, 547. 



Al>scissio iiifiniti, 79, 713. 



Ahstract terms, 27 ; number, 159. 



Abstraction, 704 ; logical, 25 ; nu- 

 merical, 158 ; of indifferent cir- 

 cumstances, 97. 



Accadeniia del Cimento, 427, 432, 

 43C, 527. 



Accident, logical, 700. 



Accidental iliscovery, 529. 



Achromatic lenses, 432. 



Actinometer, 337. 



Adamantine medium, 605, 751. 



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

 terminate, 41. 



Adrain, of New Brunswick, 375. 



Allirmation, 44. 



Agassiz, on genera, 726 ; on crea- 

 tion of species, 763. 



Agreement, 44. 



Airy, Sir George I)iddell, 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 jiolation, 495 ; Thales' 

 ccli[)se, 537 ; interference of 

 light, 539 ; density of earth, 291. 



Alchemists, 505 ; how mishd, 428. 



Algebra, 123, 155, 164; Diophaii- 

 liiie, 631. 



Algebi'aic, e(juations, 123 ; geo- 

 metry, 633. 



Allotropic statu, 663, 070. 



Alloys, possible number, 191 ; pio- 

 perties, 5'J,S. 



Alphabet, the Logical, 93, 104, 1 25 ; 

 Morse, 193. 



Alphabet, permutations of letters of 

 the, 174, 179. 



Alphabetic indexes, 714. 



Alternative relation.s, 67; exclusive 

 and unexclusive, 205. 



Ainjjei-e, 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 ; 

 failute 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 defined, 225. 



Anticipation of Nature, 509. 



Anticipations, of Principle of Sub- 

 stitution, 21 ; of electric tele- 

 giaph, 671. 



Ai)paunt, equality, 275 ; sequence 

 of events, 409. 



Approximation, theory of, 456 ; to 

 exact laws, 4(52 ; mathematical 

 principles of, 471 ; arithmetic cv', 

 4S1. 



Aqueous vajiour, 500. 



Aquinas, on disjunctive jiropoti- 

 tions, 69. 



3 D 2 



