Parley P. Pratt
The trek through the desert slowed in the heat of late spring 1851.

May 23rd heavy roads up hill and sandy, day hot. Arrived at Salt Springs gold mines towards evening; water brackish . . . After resting for a few hours we started on in the evening and traveled all night, with the exception of short intervals of rest. The hot day and heavy roads had so harassed the cattle that we made but little progress . . . camp in a suffering condition, some cattle had given out entirely, and fifteen or twenty miles between us and water. This was the most trying time of all.

Parley P. Pratt, The Autobiography of Parley Parker Pratt, pp. 420-21.