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When I advise him to read science, I do not mean that he should choke himself with the dust of the pedants, and lose himself in the subdivisions of the Lepidoptera, or the classifications of the dicotyledonous plants. These dreary details are the prickly bushes in that enchanted garden, and you are foolish indeed if you begin your walks by butting your head into one.
There are so many geometries, so many logics, so many physical and chemical hypotheses, so many classifications, each one of them good for so much and yet not good for everything, that the notion that even the truest formula may be a human device and not a literal transcript has dawned upon us.
He entitles this final division of his treatise, "Medicine of the Soul," on the ground that virtue is the health of the soul as vice is its disease. In his fundamental ethical distinctions, definitions and classifications he combines Plato's psychology and the virtues based thereon with the Aristotelian doctrine of the mean, which he also applies in detail.
He notes the stages and points to which his plans have reached; he indicates, with a favourite quotation or apophthegm "Plus ultra" "ausus vana contemnere" "aditus non nisi sub persona infantis" soon to be familiar to the world in his published writings the lines of argument, sometimes alternative ones, which were before him; he draws out schemes of inquiry, specimen tables, distinctions and classifications about the subject of Motion, in English interlarded with Latin, or in Latin interlarded with English, of his characteristic and practical sort; he notes the various sources from which he might look for help and co-operation "of learned men beyond the seas" "to begin first in France to print it" "laying for a place to command wits and pens;" he has his eye on rich and childless bishops, on the enforced idleness of State prisoners in the Tower, like Northumberland and Raleigh, on the great schools and universities, where he might perhaps get hold of some college for "Inventors" as we should say, for the endowment of research.
Concerning their external characteristics we know much; and our classifications, if not satisfactory to all, are at least eminently useful. But when one turns to the morphological sciences of anatomy, histology, embryology, and pathology, one discovers great gaps, where knowledge might reasonably be expected.
These laws and others in biology, if developed on concrete specimens, give much insight into the whole realm of nature, more stimulating by far than that based on scientific classifications, as orders, families and species. The great and simple outlines of nature's work begin to appear out of such laws.
And similarly in zoology, the successive classifications, from having been originally determined by external and often subordinate characters not indicative of the essential nature, have been gradually more and more determined by those internal and fundamental differences, which have uniform relations to the greatest number of other differences.
It is proved that man has a soul, that the soul is not material or corporeal, that it is a substantial entity and not a mere quality or accident of the body. Both Plato and Aristotle are laid under contribution in the various classifications of the soul that are found in Saadia, in Joseph Ibn Zaddik, in Judah Halevi, in Abraham Ibn Daud, in Maimonides.
But indeed it is true for all who can see the facts of life simply and plainly, that man is an omnivorous, versatile, various creature and can draw his strength from a hundred varieties of nourishment. He has physiological idiosyncrasies too that are indifferent to biological classifications and moral generalities.
This case seems to me well to illustrate the spirit with which our classifications are sometimes necessarily founded. Practically when naturalists are at work, they do not trouble themselves about the physiological value of the characters which they use in defining a group, or in allocating any particular species.
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