Gentlemen and innkeepers may supplied with the best LONDON PORTER, from the noted House of FELIX, CALVERT, and Co. at £1. 18s. per Barrel, containing 36 Gallons, 19s. 6d. per Kilderkin, containing 18 Gallons. By JOHN PROCKTER, At the Top the Swan Yard, near the Cross, LEEDS.
He also begs Leave to acquaint his Friends and the Public, That he has begun sell RUM, BRANDY, GENEVA, &c. by Retail as well as Wholesale, on the very lowest Terms.
Leeds Intelligencer - Tuesday 10 June 1777, page 2.
How had the Porter got to Leeds, which is well inland? Probably by water. In the early 18th century a canal - the Aire and Calder Navigation - linked Leeds to the sea at Goole. My guess would be that the Porter came along that route. First by sea from London to Goole and from there to Leeds by river and canal.
Felix Calvert was, at the time, one of the largest London Porter breweries, hence one of the largest breweries in the world. As you can see in this table, they were in third place, behind only John Calvert and Whitbread:
|Largest London Porter brewers in 1777|
|“The Brewing Industry in England 1700-1830”, Peter Mathias, 1959, p 551-552|
Why did they bother mentioning that a barrel was 36 gallons and a kilderkin 18 gallons? Because this is from a time when Ale and Beer barrels were different sizes. An Ale barrel held just 32 gallons and an Ale Kilderkin 16 gallons.
Price stability. Something that's hard to imagine nowadays. In 1914, a barrel of Porter cost 36 shillings.