XXIV.—Letters from a Subaltern Officer of the Earl of Essex's Army, written in the Summer and Autumn of 1642; detailing the early movements of that portion of the Parliament Forces which was formed by the Volunteers of the Metropolis; and their further movements when amalgamated with the rest of the Earl of Essex's Troops. Communicated by Sir Henry Ellis, K.H., F.R.S., Director, in a Letter to the Viscount Mahon, President