In his 26th year Whistler published his graduation thesis at Leiden; this was the first description of rickets as a definite disease manifesting itself by a more or less constant association of symptoms. Still (No. 6356) gives an interesting account of Whistler, with abstracts from the above work. The book attracted little attention, and the credit for the first description is usually given to Glisson. English translation by G.T. Smerdon, J. Hist. Med., 1950, 5, 397-415.