he started, towards the end of june, on his expedition to glen roy, of which he writes to fox: "i have not been very well of late, which has suddenly determined me to leave london earlier than i had anticipated.

Write the above sentence using proper case.
He started, towards the end of June, on his expedition to Glen Roy, of which he writes to Fox: "I have not been very well of late, which has suddenly determined me to leave London earlier than I had anticipated.