From Joseph Henry   3 October 1842

My Dear Sir

I forward to you by my young Friend Mr Cuyler about two months ago a few articles of natural history and two no of Torrey and Gray's flora. I have found to day in one of the drawers of my study a copy of the 2 ^nd no of the 2 ^nd vol of the flora with your name written on the cover and the idea has occurred to me that I have by mistake sent to you two nos of the same kind. Please to inform me what nos of the flora you have received and I will endeavour to complete your set as soon as the work is published. […] new way in the science. This is the season of our college vacation and I am about commencing to day a new series of experiments on electricity. My last labours in this line produced a series of interesting results. I was enabled to magnetize needs by an induced current at the distance of 30 feet from the primary current in the cellar of the Philosophical cabinet by a single spark from the electrical machine placed in the third story of the same building without any connection by mere induction or disturbance of the elec equilibrium of the electrical plenum and also magnetize to produce similar effects in my study by flashes of lightening at the distance of seven and eight miles.