Diatoms in the London Clay

Abstract

I REGRET to find that there are some beautifully mounted slides in circulation in London that have been sold, and are labelled as diatoms from the London clay, which are not what they purport to be. To prevent further disappointment to microscopists, will you allow me to say that arrangements have been made for slides of the London clay diatoms to be procurable shortly at any of the usual places? Due notice will be given by advertisement in this paper, when and by whom slides can be supplied to the trade.