This early version of a microscope was helpful in A) determining the temperature of the air. B) determining the amount of moisture in the air. C) observing heavenly objects too far away to be seen by the naked eye. D) observing objects and processes too small to be seen by the naked eye.

- "the die is cast; i have consented to return if we are not destroyed. thus are my hopes blasted by cowardice and indecision; i come back ignorant and disappointed. it requires more philosophy than i possess to bear this injustice with patience. i have lost my hopes of utility and glory; i have lost my friend."