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.