The Mongol in Our Midst

The Mongol in Our Midst: A Study of Man and His Three Faces is the title of the pseudo-scientific book written by British physician Francis Graham Crookshank and published in 1924.

The book, characteristic of the consequently discredited ideas of scientific racism prevalent at the time, explored and presented the idea that "Mongolian imbecility" (a form of intellectual disability now called Down's syndrome and known to be caused by the replication (trisomy) of the chromosome 21) was an atavistic throwback to, and/or the result of, rape committed by members of the supposedly more primitive "Mongoloid races" (such as the Huns, Avars or the Mongols themselves) in the wake of their various invasions of Europe throughout history. The book also claimed that "Mongolian imbecility" was partly the result of Ashkenazi Jews having interbred with the steppe tribe of the Khazars.