Note in Sinnett's handwriting:
Letter from K.H. to AOH. rec. June 30th, 1882.
Simple prudence misgives me at the thought of entering upon my new role of an "instructor." If M. satisfied you but little I am afraid of giving you still less satisfaction since besides being restrained in my explanations, — for there are a thousand things I will have to leave unrevealed — by my vow of silence I have far less time at my disposal than he has. However, I'll try my best. Let it not be said that I failed to recognise your present sincere desire to become useful to the Society, hence to Humanity, for I am deeply alive to the fact that none better than yourself in India is calculated to disperse the mists of superstition and popular error by throwing light
Dr. Mayer was Julius Robert von Mayer (1814-1878), a German physician and physicist, a founder of thermodynamics. He is best known for enunciating in 1841 that "energy can be neither created nor destroyed".