All by W. A. Firth, comprising of:

1 - A slide labeled Diatomaceae Selected Type slide 41sp, San Redondo California, with a printed list in a card case marked Type Slide C 37/6.
2 - A slide labeled Diatomaceae Selected Type slide 34sp, Fossil Marine deposit, South Naparima Trinidad, with a printed list in a card case marked Type Slide 25/6 £2.10.00
3 - A slide labeled Diatomaceae Selected Type slide 35sp, Sponge Sand, Levant, with a printed list in a card case marked Type Slide 25/6 £2.10.00
4 - A slide labeled Diatomaceae Selected Type slide 30sp, Marine Constantinople, with a printed list in a card case marked Type Slide 20/-

Conditions:
1 – some diatoms out of place
2 – poor not able to view
3 – some diatoms out of place with some crystallisation of balm
4 - some diatoms out of place with some crystallisation of balm