Sanderson's Prize essay manuscript, ‘The Origin and Development of the Embryo in Phanerogamous Plants’, submitted in July 1849 as part of his Botany course for his Medical degree at the University of Edinburgh. Sanderson has illustrated the manuscript with pencil illustrations drawn from the microscope.
Impressed by the content, Hutton Balfour deemed it worthy of a prize, with part of the content read at a meeting of the Botanical Society of Edinburgh in February 1850.

1 ink drawing.

[TEXT on back]
Habitat x1 CGP 6494 [CPG? 6494]
flower detail x 4

1 ink drawing by Margaret Tebbs.

[TEXT ON BACK]
Habitat x1 G&C 236
Flower detail x4
Stamens x 6 G&C 205/CPG7118
Ovary x12 G&C 205/CPG7118

1 ink drawing by Margaret Tebbs.

[TEXT on back]
Pelargonium sp.
GBB493
1 habitat x1
2 exploded flower x3
3 stamens x6
4 ovary x6

4 original Pelargonium drawings by Margaret Tebbs.

1 ink drawing by Margaret Tebbs.

[Text on Back]
Pelargonium sp.
1 habitat x1
2 tubers x 2
3 exploded flower x3
4 stamens x6
5 ovary x10