Great pains had been taken by my parents to instill the doctrines of Christianity into my mind, and I had no difficulty in understanding the theory of our free salvation by the atonement of our Savior, but it was only about this time that I really began to feel the necessity and value of a personal application of the provisions of that atonement to my own case. The change was like what may be supposed would take place were it possible to cure a case of "color blindness". The perfect freeness with which the pardon of all our guilt is offered in God's book drew forth feelings of affectionate love to Him who bought us with his blood, and a sense of deep obligation to Him for his mercy has influenced, in some small measure, my conduct ever since. But I shall not again refer to the inner spiritual life which I believe then began, nor do I intend to specify with any prominence the evangelistic labors to which the love of Christ has since impelled me. This book will speak, not so much of what has been done, as of what still remains to be performed, before the Gospel can be said to be preached to all nations. In the glow of love which Christianity inspires, I soon resolved to devote my life to the alleviation of human misery. Turning this idea over in my mind, I felt that to be a pioneer of Christianity in China might lead to the material benefit of some portions of that immense empire; and therefore set myself to obtain a medical education, in order to be qualified for that enterprise. In recognizing the plants pointed out in my first medical book, that extraordinary old work on astrological medicine, Culpeper's "Herbal", I had the guidance of a book on the plants of Lanarkshire, by Patrick. Limited as my time was, I found opportunities to scour the whole country-side, "collecting simples". Deep and anxious were my studies on the still deeper and more perplexing profundities of astrology, and I believe I got as far into that abyss of phantasies as my author said he dared to lead me. It seemed perilous ground to tread on farther, for the dark hint seemed to my youthful mind to loom toward "selling soul and body to the devil", as the price of the unfathomable knowledge of the stars. These excursions, often in company with brothers, one now in Canada, and the other a clergyman in the United States, gratified my intense love of nature; and though we generally returned so unmercifully hungry and fatigued that the embryo parson shed tears, yet we discovered, to us, so many new and interesting things, that he was always as eager to join us next time as he was the last.