'The following experiements and objects of interest were shown by the gentlemen named... Mr H. Darwin - Morin's machine for testing the laws of falling bodies. Dr Anderson Stuart's Kymoscope for demonstrating the interference of wave motion. Re-action time chronograph for measuring the quickness with which a person can move his hand upon hearing a sound. Musical pitch apparatus for testing the appreciation of differences of musical pitch. Galton's whistle for testing the limit of hearing shrill notes. Line divider for testing the capacity of dividing a line by eye. Angle divider for testing the capacity of judging a right angle. Box of weights for testing teh capacity of appreciating small differences of weight.'

'1880... March. 1. Mr Horace Darwin.

Photonephometer.'

note: 'delvd' (f. 4.)

'1880... June. 9. Horace Darwin Esq.

Photonephometer'

note: 'delvd' (f. 7)

'1880... June. 18. H. Darwin Esq.

To rearrange BA Unit Coil' (f. 7)

'1880... July. 8. H. Darwin Esq.

Actinometer.' (f. 7)