Public Domain Mark
You can use this work for any purpose without restriction under copyright law. Read more about this licence.
Credit
Left, catheters for the treatment of stones and disesases of the urethra; right, a boy held in the right position for the performance of the cutting of a stone and various instruments for this operation. Engraving with etching by R. Parr. Wellcome Collection. Public Domain Mark. Source: Wellcome Collection.