AND here we come in face of the fact before obliquely glanced at, that Sir Henry Maine’s hypothesis takes account of no stages in human progress earlier than the pastoral or agricultural. The groups he describes as severally formed of the patriarch, his wife, descendants, slaves, flocks, and herds, are groups implying that animals of several kinds have been domesticated.
THERE has always been a difficulty in the minds of teachers, as well as in the minds of learners, to comprehend the theory of the tides as presented in our text-books. This theory fails to give a satisfactory account of the cause of the tides on the side of the earth most remote from the sun and the moon.
IF in the two preceding lectures I have tried to draw your attention to the penetration of the air into our clothing and our dwellings, I shall try in this last lecture to do the same in reference to the air which is in the ground, and to its connection and intercourse with the air above the ground.
A BRIEF HISTORICAL SKETCH OF THE DISCOVERY OF THE CIRCULATION OF THE BLOOD.
GEORGE JACKSON FISHER
AMONG the great discoveries which the genius and patient research of man have developed, none lay us under more grateful obligations, in view of its practical value and admirable simplicity, than that of the circulation of the blood. Historians record the rise, progress, and decline of nations, the discovery of new countries, and the exploits of conquering heroes, and yet pass almost unnoticed the achievements of men of science.
WHY does the prevailing business depression continue? Why are the times so “hard?” Why is the long-hoped-for revival of trade so backward? What is it that has put the times so disastrously out of joint? Every one is asking these questions, and nearly every one is ready with an answer.
THE great influence that may be exerted upon living beings by atmospheric pressure is now questioned by none, and there is even a disposition to exaggerate its importance. If the barometric column rises or falls a few millimetres, nervous people affected with the asthma perceive phenomena, whether of a beneficial or of a noxious, kind, which they do not hesitate to attribute to the weight or to the lightness of the atmosphere.
THE law of the mechanical equivalent of heat may be summed up in the following propositions, viz.: The heat required in order to raise a given weight of water one centigrade degree of temperature can also lift the same weight 1,300 feet, or, more exactly, 424 metres. Thus to the unit of heat there corresponds a definite amount of work.
THE facts which I propose to consider in this paper have been brought to light by means of the experimental method. They are very interesting, both physiologically and psychologically viewed. I shall occupy myself with the physiological aspects only, and their bearing on human pathology.
TO be able to live, in any way known to us, it is indispensable to have a body. And, as living bodies come by growth and continue by nourishment, it is first necessary to have materials where of bodies can be made—and renewed and kept in warmth and strength.
THE purpose of this contribution is to draw attention to a phenomenon which has received too little notice, and has been strangely neglected by astronomers, but which, in fact, if the conclusions of the author of the work under review are correct, is to the inhabitants of the earth one which emanates from a very near and remarkable cosmical body.
AMONG English physicists Dr.BALFOUR STEWART holds a distinguished place for the originality and extent of his experimental researches, the grasp of his subtile and comprehensive inquiries, and the boldness and freedom of many of his speculations.
SINCE the publication of my article on “Physiology of Mind-Reading,” in the February number of your MONTHLY, I have received the following, which, as presenting a new phase of the subject, is of much interest. There are three general methods of mindreading—by the touch, by the eye, and by the ear.
THE progress of scientific education is slow, but the evidences of its reality are unmistakable. Among the recent and most encouraging illustrations of it, we note the various arrangements in different colleges for making excursions and expeditions for observation and the collection of specimens by students who are sufficiently interested to extend their studies in these directions.
THE honor will be unhesitatingly accorded to Lieutenant Payer of having written the most deeply-interesting volume that has yet appeared on arctic adventure and exploration. We have rarely been so fascinated by a book of any kind, upon any subject.
Reopening of an Old Route into Siberia. —Fully three hundred years ago the Russians carried on an extensive trade between Archangel and the settlements on the Obi and Yenisei. About the same period the Kara Sea was navigated by English and Dutch mariners, in search of a northeast passage to Japan.
THE Christian Union has begun the publication of a series of articles, by distinguished writers, on “How to spend the Summer.” Each writer will speak from personal experience, and, if the articles we have seen are a fair sample of those to come, everybody seeking health or pleasure, either at home or abroad, will be profited by reading them.