This is only to acknowledge the Receipt of three very agreable Letters from you, and to promise an Answer as soon as I have a little got thro’ a Hurry of Business, that beats every philosophical Thought out of my Head. As you are on the Study of Magnetism, I send you herewith a Work of the greatest Master of Practical Magnetics that has appear’d in any Age. With very great Esteem and Respect, I am, Sir, Your most obedient humble Servant