Entitled, Literary and philosophical letters and papers of Henry Baker esq., F.R.S. and A.S., including correspondence with many of the most distinguished scientific observers of his day. The items cover his microscopical work, including experiments on the regeneration of Hydra (the Polyp). They also include extensive notes on his practice as a tutor for children with speech impediments. The material is arranged chronologically and the collection includes an index.
The breakdown of the volumes is thus:
- I: 1722-1744;
- II: 1745-1746;
- III: 1747-1748;
- IV: 1749-1750;
- V: 1751-1753;
- VI: 1754-1757;
- VII: 1758-1762;
- VIII: 1763-1770.