Slide showing three photographs of a child before and after and without treatment for 'cretinism' Slide shows three black and white photographs labelled 'A', 'B' and 'C' of a child before and after and without treatment for 'cretinism'. Label underneath photograph reads 'Fig. 540. A.a cretin 23 months old. B. the same child 34 months old, after administration of sheep's thyroids for 11 months. C. a cretin, untreated, 15 years old. (W. Osler).' Handwritten white label above slide reads 'Cretin Treatment'. A cretin has stunted mental and physical growth as a result of having too few thyroid hormones (hypothyroidism). Late 19th - early 20th century