The sketching out of a course would be far beyond the scope of this paper. Here it may only be said that the work must, of necessity, fall into two main parts. There must be, on the one hand, field-naturalist's work, for the greater proportion of the animals and plants studied ought--so far as is in any way practicable--to be observed in their natural surroundings; and there must be, on the other hand, work allied to that of the gardener and farmer, the rearing of selected plants and animals for purposes of experiment and of closer examination. Nothing worth mentioning can be done on either of these lines without some study of the food and climatic conditions required by each creature; and this will involve a study of soils, temperature, atmosphere, and so on--and also a study of the nutrient properties of those organisms which furnish forth the food of other organisms. From this knowledge, gained thus through direct observation and experiment, would be deduced the general principles which--so to express it--govern life; and upon it as foundation would be reared the more specialised knowledge of all that pertains strictly to the life of mankind. Throughout the aim should be to use books mainly for reference. It is not necessary--as it might have been a few years ago--to show that a training on these lines is better, as a preparation for life, than that offered by the ordinary school and university curriculum; but it may be worth while to show how far and why it is superior to a well-planned course in the analytical biology of the laboratory. The superiority is surely twofold: in that the kind of knowledge acquired is of greater practical utility; and, again, in that the development which it ensures, to the powers, bodily and mental of the student, is more varied, thorough, and effective. COMMON-SENSE BIOLOGY AS AN ART As has been said, this Common-sense Biology partakes of the nature of an art. Now it is characteristic of any art that, for its satisfactory exercise, it demands not only knowledge, but also intuition;--not only conscious volition, reflection, and endeavour, but also subconscious nervous and muscular activity, and, together with that, a certain emotional state--a trend, tendency, disposition of the whole being, which likewise is chiefly subconscious.