I am trying to find the joke that is referenced in this quote from Walter Lippmann's Public Opinion. I must assume that it was such a well known joke at the time that he did not bother to actually tell it in the book. I have included the surrounding quote for context, in case it helps jog someone's memory. Thank you for your time.

Quote, emphasis mine:

“There is in each set of stereotypes a point where effort ceases and things happen of their own accord, as you would like them to. The progressive stereotype, powerful to incite work, almost completely obliterates the attempt to decide what work and why that work. Laissez-faire, a blessed release from stupid officialdom, assumes that men will move by spontaneous combustion towards a pre-established harmony. Collectivism, an antidote to ruthless selfishness, seems, in the Marxian mind, to suppose an economic determinism towards efficiency and wisdom on the part of socialist officials. Strong government, imperialism at home and abroad, at its best deeply conscious of the price of disorder, relies at last on the notion that all that matters to the governed will be known by the governors. In each theory there is a spot of blind automatism.

That spot covers up some fact, which if it were taken into account, would check the vital movement that the stereotype provokes. If the progressive had to ask himself, like the Chinaman in the joke, what he wanted to do with the time he saved by breaking the record, if the advocate of laissez-faire had to contemplate not only free and exuberant energies of men, but what some people call their human nature, if the collectivist let the center of his attention be occupied with the problem of how he is to secure his officials, if the imperialist dared to doubt his own inspiration, you would find more Hamlet and less Henry the Fifth. For these blind spots keep away distracting images, which with their attendant emotions, might cause hesitation and infirmity of purpose. Consequently the stereotype not only saves time in a busy life and is a defense of our position in society, but tends to preserve us from all the bewildering effect of trying to see the world steadily and see it whole.”