Copy of a letter, on the history of cataracts from Walthier [Rhaeti?] to J J [Johann Jakob] Scheuchzer Copy of a letter from Walthier regarding his history of cataracts. Includes a decorative floral figure in text. Subject: Medicine Read to the Royal Society on 22 February 1727. Waltheri Rhaeti's letter to J Woolhouse on the same subject is printed in 'Philosophical Transactions', vol 35, no 399, p 315. [1720s]