He could not always take his wife with him, as the districts he explored were so wild and savage. He ran risks of death by thirst, by hostile tribes and disease, and went through terrible places where no woman could have lived. But on many a long and perilous journey she went with him. "When I took her," writes Livingstone, "on two occasions to Lake Ngami and far beyond, she endured more than some who have written large books of travel."