“Gould asserted that Morton, believing that brain size was a measure of intelligence, had subconsciously manipulated the brain volumes of European, Asian and African skulls”
Perhaps you didn’t realize that Gould could read Morton’s mind as well as his paper.
During his lifetime, Gould constantly distorted, lied and bullied his way through his arguments about intelligence. Very few took him on. As a matter of fact, the Times provided fawning portraits of him.