You have broached and thrown a lot of light on a splendid problem, which some day will be solved.

It rejoices me to think that, when a boy, I was shown an erratic boulder in Shrewsbury, and was told by a clever old gentleman that till the world's end no one would ever guess how it came there.
It makes me laugh to think of Dr.Dawson's indignation at your sentence about "obliquity of vision." (358/1.

See Letter 144.) By Jove, he will try and pitch into you some day.

Good night for the present.
To return for a moment to the Glacial period.

You might have asked Dawson whether ibex, marmot, etc., etc., were carried from mountain to mountain in Europe on floating ice; and whether musk ox got to England on icebergs?
Yet England has subsided, if we trust to the good evidence of shells alone, more during Glacial period than America is known to have done.
For Heaven's sake instil a word of caution into Tyndall's ears.