[621] Par. i. 115, 117; De Mon. I. xv. 38-41; and III. vii. 30, 31, etc.
[622] Par. i. 92, 130-134.
[623] “This earth, together with the sea, is the centre of heaven.” (Conv. III. v. 63-65.)
[624] “It is agreed among learned men that earth and water together form a globe.” (El. Ast. iii.).
[625] Qu. xviii. 28-54. This may be compared with Par. xxix. 13-18.
[626] Qu. xv. 10, 11.
[629] “Or nearly.” Qu. xix. 61-63.
[630] Compare with Conv. II. vii. 88-100, where the poet says that the influence from each sphere comes on the rays of the planet in that sphere, also De Mon. III. iv. 139, 140.