I never knew about this essay. Here’s the open:

I understand that what you want is not a publishable article but merely a conspectus or brief, which will aid the comprehension of two remarkable historical phenomena.
First, why is it that Liberalism is now motivated by principles exactly opposite to those which originally motivated it, and how did this change come about? Second, why has the spirit and temper of Liberals undergone a corresponding change, and how did this change come about?
The facts are clearly apparent. We now see on all sides the extraordinary spectacle of Liberals doing their best to destroy the cardinal freedoms and immunities which Liberals formerly defended, while all the forces which are historically and traditionally known as Tory or Conservative are arrayed in defense of those freedoms. Furthermore we see Liberals vehemently vilifying those who hold to the original basic principles of Liberalism, denouncing them as enemies of society, and doing all they can to discredit and disable them. These two are probably the strangest anomalies that recent history presents. . . .