and be diffused over the regions of unlimited space. This inquiry furnishes him with the following conclusions, which may be regarded as a briefs summary of the whole. First, That there is a tendency to equalization of temperature over the whole surface of the earth. Secondly, That this continues to operate in such a manner, that in the progress of time the difference at different parts must become less than what existed at a preceding period; and that ultimately, a temperature nearly uniform shall be established over the whole.' Thirdly,

The temperature of the globe must, from the mode in which heat is communicated to it, rise, and at the same time, as it advances, must become more equal over the whole surface. And this rise has its limits; there cannot be either unlimited increase of heat, or indefinite refrigeration; but the final result will be a state of permanence and uniformity, the continuance of which is secured by the very circumstance, that, if it is deviated from, the deviation must check itself.'

Dr. Murray has also analysed the mineral waters of Dunblane and Pitcaithly, an account of which was read to the same society, in November, 1814. The waters of Dunblane have been lately discovered, and consist of two springs of the saline class, called the North and South springs. The specific gravity of the water of the North spring is 1:00175; and it does not suffer any change in its sensible qualities from exposure to the atmospheric air. A careful analysis

in which these sciences are involved for want of system, he presents the following, as the general outlines of his plan.

"In viewing, then, the organs in a general manner, a class at once obtrudes itself, from its consisting of an apparatus of levers, from its performing motion from place to place, or locomotion, and from these motions being of the most obvious kind. A little more observation presents to us another class, which is distinguished from the preceding by its consisting of cylindrical tubes, by its transmitting and transmuting liquids, or performing vascular action, and by its motions being barely apparent. Further investigation discovers a third, which differs essentially from both these, in its consisting of nervous particles, in its transmitting impressions from external objects, or performing nervous action, and in that action being altogether invisible.

"Thus each of these classes is distinguished from another by the STRUCTURE of its parts, by the PURPOSES which it serves, and by the greater or less OBVIOUSNESS of its motions.

"The human body, then, consists of organs of three kinds. By the first kind, motion from place to place, or mechanical action, is effected; by the second, nutrition, or vital action, is maintained; and by the third, thought, or intellectual action, is permitted. ANATOMY I therefore divide into three parts; namely, that which considers the mechanical or locomotive organs, that which considers the vital organs, and that

which considers the intellectual organs.

"Under the mechanical or locomotive organs, I class, first, the bones, which support the rest of the animal structure; second, the ligaments, which unite them; and third, the muscles, which move them.

"Under the vital organs, I class, first, the external and internal absorbent surfaces, and the vessels which absorb from these surfaces, or the organs of absorption; second, the heart, lungs, and bloodvessels, which derive their contents (the blood) from the absorbed lymph, or the organs of circu lation; and third, the glands and secreting surfaces, which separate various matters from the blood, or the organs of secretion.

"Under the intellectual organs, I class, first, the organs of sense, where impressions take place; second, the cerebrum, or organ of thought, where these excite ideas; and third, the cerebellum, where volition results from the last.