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Here ends the first book of Spinoza's Ethics the book which contains, as we said, the notiones simplicissimas, and the primary and rudimental deductions from them. His Dei naturam, he says, in his lofty confidence, ejusque proprietates explicui.

Non substantia, non qualitas, agere, pati, ipsum esse, bonae notiones sunt; multo minus grave, leve, densum, tenue, humidum, siccum, generatio, corruptio, attrahere, fugare, elementum, materia, forma, et id genus, sed omnes phantasticae et male terminatae."

The conceptions, then, which we employ for the colligation and methodization of facts, do not develop themselves from within, but are impressed upon the mind from without; they are never obtained otherwise than by way of comparison and abstraction, and, in the most important and the most numerous cases, are evolved by abstraction from the very phenomena which it is their office to colligate. I am far, however, from wishing to imply that it is not often a very difficult thing to perform this process of abstraction well, or that the success of an inductive operation does not, in many cases, principally depend on the skill with which we perform it. Bacon was quite justified in designating as one of the principal obstacles to good induction, general conceptions wrongly formed, “notiones temerè

Itaque si notiones ipsae, id quod basis rei est, confusae sint, et tenere a rebus abstractae, nihil in iis quae superstruuntur est firmitudinis. Itaque spes est una in Inductione vera. In notionibus nil sani est, nec in Logicis nec in physicis.

Instead of operating with abstract concepts the reason uses common notions, notiones communes. Genera do not exist, but, no doubt, something common to all things.

We can not, therefore, frame good general conceptions beforehand. That the conception we have obtained is the one we want, can only be known when we have done the work for the sake of which we wanted it; when we completely understand the general character of the phenomena, or the conditions of the particular property with which we concern ourselves. General conceptions formed without this thorough knowledge, are Bacon’snotiones temerè