Found this in the book 'Dissolving Illusions: Disease, Vaccines, and The Forgotten History' by Dr. Suzanne Humphries and Roman Bystrianyk. https://dissolvingillusions.com/ To verify the books claim, I looked for sources and found them: https://vaccinefreedom.wordpress.com/2019/10/11/a-brief-history-of-infectious-diseases-vaccines/ http://www.scottishmining.co.uk/244.html Together with 'Turtles All The Way Down', I consider this a must read for anyone interested in the history of vaccination. >No.55 Ellison Jack, 11 years old, coal-bearer:- I have been working below three years on my father's account; he takes me down at two in the morning and I come up at one and two next afternoon. I go to bed at six at night to be ready for work next morning: the part of the pit I bear in the seams are much on edge. > I have to bear my burthen up four traps, or ladders, before I get to the main road which leads to the pit bottom. My task is four to five tubs; each tub holds 4 1/4cwt. I fill five tubs in 20 journeys. > I have had the strap when I did not do my bidding. Am very glad when my task is wrought, as it sore fatigues. > I can read, and was learning the writing; can do a little; not been at school for two years; go to kirk occasionally, over to Lasswade: don't know much about the Bible, so long since read: knows many of the Questions.