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CHAPTER I.

ON NATURAL LAWS.

IN natural science, three subjects of inquiry may be distinguished. 1st, What exists? 2dly, What is the purpose or design of what exists; and, 3dly, Why was what exists. designed for such uses as it evidently subserves?

It is matter of fact, for instance, that arctic regions and torrid zones exist, that a certain kind of moss is most abundant in Lapland in winter,—that the rein-deer feeds on it, and enjoys health and vigor in situations where most other animals would die; that camels exist in Africa, that they have broad hoofs, and stomachs fitted to retain water for a length of time, and that they flourish amid arid tracts of sand, where the rein-deer would not live for a day. All this falls under the inquiry, What exists?

In contemplating these facts, the understanding is naturally led to infer that one object of the Lapland moss is to feed the rein-deer, and that one purpose of the deer is to assist man: and that broad feet have been given to the camel to allow it to walk on sand, and a retentive stomach to fit it for arid places in which water is found only at wide intervals. These are inquiries into the uses or purposes of what exists; and they constitute a legitimate exercise of the human intellect.

But, 3dly, we may ask, Why were the physical elements of nature created such as they are? Why were summer, autumn, spring, and winter introduced? Why were animals formed of organized matter? Why were torrid zones and trackless wastes of snow called into existence? These are inquiries why what exists was made such as it is, or into the will of the Deity in creation.

Now, man's perceptive faculties are adequate to the first inquiry, and his reflective faculties to the second; but it may well be doubted whether he has powers suited to the third. My investigations are confined to the first and second, and I do not discuss the third.

In the introduction, p. 8, I have endeavoured to show that the Creator has bestowed definite constitutions on physical nature and on man and animals, and that they are regulated by fixed laws. A law, in the common acceptation, denotes a rule of action; it implies a subject which acts, and that the actions or phenomena which it exhibits take place in an established and regular manner; and this is the sense in which I shall use it, when treating of physical substances and beings. Water, for instance, when at the level of the sea, and combined with that portion of heat indicated by 32° of Fahrenheit's thermometer, freezes or becomes solid; when combined with the portion denoted by 212° of that instrument, it rises into vapor or steam. Here water and heat are the substances, the freezing and rising in vapor are the appearances or phenomena presented by them; and when we say that these take place according to a Law of Nature, we mean only that these modes of action appear, to our intellects, to be established in the very constitution of the water and heat, and in their natural relationship to each other; and that the processes of freezing and rising in vapor are their constant appearances, when combined in these proportions, other conditions being the same.

The ideas chiefly to be kept in view are, 1st, That all substances and beings have received a definite natural constitution; 2dly, That every mode of action, which is said to take place according to a natural law, is inherent in the constitution of the substance, or being; and, 3dly, That the mode of action described is universal and invariable, wherever and whenever the substances, or beings, are found in the same condition. For example, water, at the level of the sea, freezes and boils at the same temper

ature, in China, in France, in Peru, and in England; and there is no exception to the regularity with which it exhibits these appearances, when all its other conditions are the same: For this last qualification must constantly be attended to in all departments of science. If water be carried to the top of a mountain 20,000 feet high, it will boil at a lower temperature than 212°; but this depends on its relationship to the air, and takes place also according to fixed and invariable principles. The air exerts a great At the level of the sea the pressure pressure on water. is every where nearly the same, and in that situation the freezing and boiling points correspond all over the world; but on the top of a high mountain the pressure is much less, and the vapor not being held down by so great a power of resistance, rises at a lower temperature than 212°. But this change of appearances does not indicate a change in the constitution of the water and the heat, but only a variation in the circumstances in which they are placed; and hence it is not correct to say, that water boiling on the tops of high mountains, at a lower temperature than 212o, is an exception to the general law of nature: there never are exceptions to the laws of nature; for the Creator is too wise and too powerful to make imperfect or inconsistent arrangements. The error is in the human mind inferring the law to be, that water boils at 212° in all altitudes; when the real law is only that it boils at that temperature, at the level of the sea, in all countries; and that it boils at a lower temperature the higher it is carried, because there the pressure of the atmosphere is less.

Intelligent beings are capable of observing nature and of modifying their actions. By means of their faculties, the laws impressed by the Creator on physical substances become known to them; and, when perceived, constitute laws to them, by which to regulate their conduct. For example, it is a physical law, that boiling water destroys the muscular and nervous systems of man. This is the result purely of the constitution of the body, and the rela

tion between it and heat; and man cannot alter or suspend that law. But whenever the human intellect perceives the relation, and the consequences of violating it, the mind is prompted to avoid infringement, in order to shun the torture attached by the Creator to the decomposition of the human body by heat.

Similar views have long been taught by philosophers and divines. Bishop BUTLER, in particular, says:—" An Author of Nature being supposed, it is not so much a deduction of reason as a matter of experience, that we are thus under his government, in the same sense as we are under the government of civil magistrates. Because the annexing pleasure to some actions, and pain to others, in our power to do or forbear, and giving notice of this appointment beforehand to those whom it concerns, is the proper formal notion of government. Whether the pleasure or pain which thus follows upon our behavior, be owing to the Author of Nature's acting upon us every moment when we feel it, or to his having at once contrived and executed his own part in the plan of the world, makes no alteration as to the matter before us. For, if civil magistrates could make the sanctions of their laws take place, without interposing at all, after they had passed them, without a trial, and the formalities of an execution; if they were able to make their laws execute themselves, or every offender to execute them upon himself, we should be just in the same sense under their government then as we are now; but in a much higher degree and more perfect manner. Vain is the ridicule with which one sees some persons will divert themselves, upon finding lesser pains considered as instances of divine punishment. There is no possibility of answering or evading the general thing here intended, without denying all final causes. For, final causes being admitted, the pleasures and pains now mentioned must be admitted too, as instances of them. And if they are, if God annexes delight to some actions, with an apparent design to induce us to act so and so