Commentary: 'The next trick is impossible.'

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Abstract
In 1906, Wilhelm Wundt wrote a reference for his departing student, Charles Spearman, in which he described the latter as an ‘investigator who is thoroughly versed in the physical mathematical sciences auxiliary to psychology’.1 Experimental Psychology had progressed quickly from its infancy in the 1860s to its first schools at the end of the 19th century when, Leipzig based, Wundt was its most highly regarded teacher. Wundt’s praise of Spearman’s mathematical skills reflected the impact that his new (1904)2,3 statistical procedures were having upon the scientific community.

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