Sentence:  This purely painless process, this descent by oblivious trance into oblivion, this natural physical death, is the true <WSD>euthanasia</WSD>; and it is the duty of those we call physicians to secure for man such good health as shall bear him in activity and happiness onward in his course to this goal. For <WSD>euthanasia</WSD>, though it be open to every one born of every race, is not to be had by any save through obedience to those laws which it is the mission of the physician to learn, to teach, and to enforce. <WSD>Euthanasia</WSD> is the sequel of health, the happy death engrafted on the perfect life. 
Meaning of the word marked with <WSD> tags:  An easy death, or the means to bring about such a death.