LETTER: British Drug Houses Ltd., Graham Street, London to H P Sherwood Esq., Fisheries Experiment Station, Castle Bank, Conwy. Replies that 0.1c.c. of the o-tolidine reagent should be used per 10c.c. solution being tested.

Scope and Content

Annexed:

1. COPY LETTER: HPS to BDH enquiring as above.

2. LEAFLET: ‘The Lovibond Comparator for use with BDH Indicators’.