Creed, Mathematics of a, I, 329.
Cribb, T., I, _314_.
Crotus, J., I, 318.
Cruickshank, G., I, _186_.
Cube, Duplication of, I, 349.
Cumyns, Eliza, I, 299.
Cunningham, I, 172, _172_.
Curabelle, I, _221_.
Curious Calculations, II, 66.
Curll, E., II, _279_.
Cusa, I, _44_, 47, 360.
Custom, II, 324.
Cyclometry, II, 208. (_See Squaring of the Circle._)
Cyclopaedias, Review of, II, 280.

D'Alembert, I, _382_; II, 283, 364.
Dalgarno, I, 116, _117_.
Dalton, J., I, _255_.
D'Arblay, Mme., I, _190_.
Darwin, E., II, _8_.
Darwinism, Primitive, I, 344.
Dary, M., II, _305_.
Daval, P., II, _298_.
Davies, T. S., II, 151, _151_, 188.
Day, A., I, 295, _295_.
De Baruel, I, 165.
De Beaune. (_See Beaune._)
De Becourt, II, 277, _277_.
Debenham, J., I, _393_.
De Causans. (_See Causans._)
Dechales. (_See de Challes._)
De Challes, I, _45_.
Decimal coinage, II, 80, 168, 169.
Decimals run riot, II, 80.
Dee, J., II, _302_.
De Faure, I, 149.
De la Leu, I, _297_.
Delambre, I, _160_, 167, 354; II, 165.
Democritus, II, _34_.
De Moivre, I, 24, _376_; II, 298.
De Molieres, I, _220_.
De Molina, I, _297_.
Demonville, I, 291, 293.
De Morgan, A., I, 191, 383; II, 194.
--Refusal of LL. D., I, 191.
De Morgan, G. C., I, 383.
De Morgan, Mrs., I, _196_; II, 194.
Denison, J., I, 348, 353.
Desaguliers, I, _153_, 156, 157.
Desargues, I, _119_, 221.
Descartes, I, 5, 59, 105, 132, 165, 204, 220; II, 94.
De Serres, II, _60_.
De Sluse. (_See Sluse._)
De Thou, I, 51, _111_, 113; II, 295.
De Vausenville, I, 12.
Devonshire, Duke of (7th), I, _290_.
Diamandi, I, 86.
Didacus Astunica, I, 90.
Diderot, II, _4_, 283, 339.
Digby, K., I, _108_.
Digges, T., and L., II, _302_.
Dionysius Exiguus, I, _360_.
Dircks, H., II, 138, _138_.
Discoverers and discoveries, II, 206.
Discovery, Basis of, I, 85.
D'Israeli, I., I, _115_, 118, 136, 188, 227.
Ditton, I, _133_, 133.
Division, Nature of, II, 248.
Dobson, J., I, _234_, 234.
Dodson, J., II, _312_.
Dodt, I, _52_.
Doggerel verse, I, 341.
Dolland, I, _377_.
Double Vahu Process, II, 360.
Douglas, G., I, _232_.
Drach, S. M., II, _317_.
Drayson, G. A. W., II, _132_, 132.
Dryden, II, _71_.
Dual arithmetic, II, 186.
Duchesne, I, _52_.
Dumortier, I, 313.
Duncan, A., I, _179_.
Dunkin, E., II, _349_.
Duodecimal scale, II, 68.
Duplicati