Both come from Broadus Mitchell, the first in a 1931 piece entitled A Blast Against Economists:
And American economists — but, be it noted, economists without the gates of institutionalism — proposed thoroughgoing remedies. Chief among these was Henry George, whose idealism was as high as his testimony was eloquent. It was sought to cry him down as a fanatic with a cure-all, but history will not permit his critics to reach to his knees.
That article begins,
"The business depression points an accusing finger at professional economists. This paper is not an apology for the economists—quite the contrary. At the same time it is proper to point out that when an epidemic disease attacks the community, (a fair analogy in the physiological world) we do not upbraid the doctors. We welcome them into our houses, place our individual sick in their hands, and listen anxiously to their guesses at the source of infection. We recognize that physicians are paid by individuals, and are not conservers of the public health in the strict sense, and so we do not hold them, even collectively, responsible for the spread of typhoid or influenza. They are to lock the individual stable door after the steed is stolen, and so long as they do this with reasonable quickness and accuracy, we do not complain.
American economists have been somewhat less occupied with the ills of the individual than have doctors as a class, and yet the share of their attention demanded by the enterpriser, the lender, the borrower, the speculator as such, absolves them in part from the indictment of neglecting the public interest. Until recently the forces in American economic life have been centrifugal, and students have been invited to become specialists. This direction of their effort was not always the case. The profession of "Political Economy" clearly implies a concern for public, collective problems, and it is only within the last two generations that American economists have departed from the historical tradition. The term "economics" in the narrow sense, and, more explicitly, the term "business economics," indicates the drift toward preoccupation with private economy.
Elsewhere* I found this:
Broadus Mitchell, in his book, The World's Wealth — Its Use and Abuse, pays a high compliment to Henry George, the Economist who first proposed the taxation of rental value, saying that "If America were invited to contribute one name to an international economic hall of fame, the rest of the world would scarcely understand it if we did not nominate Henry George."
*Arthur Otis: Added Revenue Without Burden; I could not find the Mitchell book online.
A third tribute to Henry George from Broadus Mitchell is online at the School of Cooperative Individualism. It describes Mitchell as Associate Professor of Political Economy, Johns Hopkins University.