Dimorphism, b. [336].
Dioptra, a. [165].
Dipolarization, b. [80], [82].
Direct motion of planets, a. [138].
Discontinuous functions, b. [36].
Dispensatoria, b. [366].
Dispersion (of light), b. [126].
Doctrine of the sphere, a. [130].
Dogmatic school (of medicine), b. [439].
Double refraction, b. [69].