I propose, brethren, if I am able to do it--and I am somewhat dubious upon that point--to give you a set of lectures at intervals upon THE VARIOUS SCIENCES AS SOURCES OF ILLUSTRATION. It seems to me that every student for the Christian ministry ought to know at least something of every science; he should intermeddle with every form of knowledge that may be useful in his life's work. God has made all things that are in the world to be our teachers, and there is something to be learned from every one of them; and as he would never be a thorough student who did not attend all classes at which he was expected to be present, so he who does not learn from all things that God has made will never gather all the food that his soul needs, nor will he be likely to attain to that perfection of mental manhood which will enable him to be a fully equipped teacher of others. * * * * * I shall commence with the science of ASTRONOMY; and you will, at the beginning, understand that I am not going to deliver an astronomical lecture, nor to mention all the grand facts and details of that fascinating science; but I intend simply to use _astronomy as one of the many fields of illustration that the Lord has provided for us_. Let me say, however, that the science itself is one which ought to receive much attention from all of us. It relates to many of the greatest wonders in nature, and its effect upon the mind is truly marvelous. The themes on which astronomy discourses are so grand, the wonders disclosed by the telescope are so sublime, that, very often, minds that have been unable to receive knowledge through other channels have become remarkably receptive while they have been studying this science. There is an instance of a brother who was one of the students in this college, and who seemed to be a dreadful dolt; we really thought he never would learn anything, and that we should have to give him up in despair. But I introduced to him a little book called "The Young Astronomer"; and he afterward said that, as he read it, he felt just as if something had cracked inside his head, or as if some string had been snapped. He had laid hold of such enlarged thoughts that I believe his cranium did actually experience an expansion which it ought to have undergone in his childhood, and which it did undergo by the marvelous force of the thoughts suggested by the study of even the elements of astronomical science.