| Reference number | EL/A |
| Level | SubSeries |
| Title | Early Letters: A, letters in natural philosophy from correspondents with surname starting 'A' |
| Date | 1664-1736 |
| Description | Original letters and related material on natural philosophy, including illustrative items. Sent to the Royal Society for discussion at its meetings and, from 1665, for possible publication in its journal 'Philosophical Transactions'. |
| Extent | 1 volume containing 66 items |
| Format | Manuscript |
| Physical description | Quarter bound in vellum, green cloth boards. Spine marked 'A'. Green cloth slip-case. |
| Dimensions | 402x265mm. |
| Arrangement | Grouped by correspondents having surnames starting with the same letter, in this case 'A'; then chronologically within the volume |
| Access status | Open |
| Access conditions | No photocopying |