who are engaged in conducting, or in patronising or promoting education, should consider it a matter of no small moment to instil, betimes, just notions on subjects with which all must in after-life be practically conversant, and in which no class of men, from the highest to the lowest, can, in such a country as this at least, be safely left in ignorance or in error." In later years like opinions have been held and efforts made by Mr. William Ellis, Professor W.B. Hodgson, Dr. John Watts, Mr. Templar, and others, and experience seems to confirm both the need and the practicability of the teaching advocated by Whately. But it is evident that one condition of success in such efforts is the possession of a small text-book exactly suited to the purposes in view. Relying upon my experience of ten years in the instruction of pupil-teachers at Manchester, I have now put my lessons into the simplest form which the nature of the subject seems to render advisable. It is hoped that this little treatise may also serve as a stepping-stone to a knowledge of the science among general readers of maturer age, who have hitherto neglected the study of political economy. Owing to the narrow limits of the space at my disposal, it was impossible to treat the whole of the science in a satisfactory way. I have, therefore, omitted some parts of political economy altogether, and have passed over other parts very briefly. Thus the larger portion of my space has been reserved for such subjects as Production, Division of Labour, Capital and Labour, Trades-Unions, and Commercial Crises, which are most likely to be interesting and useful to readers of this Primer. UNIVERSITY COLLEGE, GOWER STREET, LONDON, W.C. _31st January, 1878_. SCIENCE PRIMERS. _POLITICAL ECONOMY_. CHAPTER I.--INTRODUCTION. #1. What is Political Economy?# Political Economy treats of #the wealth of nations#; it inquires into the causes which make one nation more rich and prosperous than another. It aims at teaching what should be done in order that poor people may be as few as possible, and that everybody may, as a general rule, be well paid for his work. Other sciences, no doubt, assist us in reaching the same end. The science of mechanics shows how to obtain force, and how to use it in working machines. Chemistry teaches how useful substances may be produced--how beautiful dyes and odours and oils, for instance, may be extracted from the disagreeable refuse of the gasworks. Astronomy is necessary for the navigation of the oceans. Geology guides in the search for coal and metals.