Letters from Barrett, Lucas to Charles Lyell, 11 May 1858 -28 November 1858

A collection of three letters with an illustration sent by Lucas Barrett from Cambridge on bird bones and whales. The letters refer to bird bones that are crucial in understanding developed bird wings. The first letter has an illustration of a bird metacarpus by Barrett (May-November 1858). Summarised by Lyell as:
1) Bird's bone from upper Green Sand
2) Fossil bird upper Gr[een]. S[an]d. also Whales from Gr[een].
3) Bird bones in Kimmeridge Clay.