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Messrs Mulcaster, Farnacres 23rd June 1787.
We have rec[eive]d your Letters of the 18th and 21st Inst with Two Weeks Coal Accounts and one Cinders Account and 8 Sets of Assays, Seven of which show the Lead to be very well worth Refining from which they were taken and the other from Woodhall Slags Lead not worth Refining. When you get any further Account about West Heugh Lead Mine we shall be glad to hear from you. We have not yet had anything further from Mr Fishwick about the Litharge. He has some Experiment to Try before he can give us a final Answer, so you will go on as if we had never done anything in this business till you receive our further directions about it. The Tryals you have made are very satisfactory as to the Smelting Litharge Slags and Test Bottoms with a flux of Slag Tails and with a flux of Common Black Slags it shows us that we need not <apply again> to the Tails of Black Slags for a flux of those articles.
The weight of Lead in the Litharge Slags and Test Bottoms according to computation from former Experiments ought to have been 10 - 20
Real Weight produced by flux with Tails of Slags was 9 3 2
Real produce by said flux short of computation – 1 18
We are, Your Humble Servants
Walton & Turner
