WCP3013

6^th Jan 71.

My dear Wallace,

Nothing gives me greater pleasure than to see my views¹ appreciated by a man like yourself. They are to create in the mass of the public such an interest in scientific things as will enable the leaders of science to obtain fair play for it in all our educational institutions.

To effect this we must appeal to the public in a [2] language they can understand, and in a manner with which they can sympathise. This I try to do.

This In air and in ocean particles are occasionally diffused — They never sink.

With regard to the "criticism"² the cause I assign is a true & demonstrable cause,³ and renders the flight to a purely hypothetical cause unnecessary. The blue [3] of heaven is by no means a constant quantity. Nor are the morning mi [illeg.] and the evening red. They vary just as one might suppose them to vary if caused as I suppose them to be caused.

Excuse this scrawl — I have just come from Africa⁴ & have a host of letters to answer.

Yours faithfully | John Tyndall⁵ [signature]