Frankenstein by Mary Shelly Chapter 24 Page 15

I exchanged my land-sledge for one fashioned for the inequalities of the frozen ocean, and purchasing a plentiful stock of provisions, I departed from land.

I cannot guess how many days have passed since then, but I have endured misery which nothing but the eternal sentiment of a just retribution burning within my heart could have enabled me to support. Immense and rugged mountains of ice often barred up my passage, and I often heard the thunder of the ground sea, which threatened my destruction. But again the frost came and made the paths of the sea secure.

By the quantity of provision which I had consumed, I should guess that I had passed three weeks in this journey; and the continual protraction of hope, returning back upon the heart, often wrung bitter drops of despondency and grief