Input (grade 10): This was a compilation of his letters to Thomas Pennant, the leading British zoologist of the day, and the Hon. Daines Barrington, an English barrister and another Fellow of the Royal Society.
Output (grade 8): This was a collection of his letters to Thomas Pennant, the leading British zoologist of the day, and the Hon. Daines Barrington, an English barrister and Fellow of the Royal Society.