a. (UN-1 7 b.)

1

1833.  Carlyle, Misc. (1840), IV. 256. Every Man … reaches downwards and upwards unsurveyable, fading into the regions of Immensity and of Eternity.

2

1847.  Hare, Guesses (ed. 3), 383. The field of operation is so vast and unsurveyable.

3