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CHAP. VII. Of the natural constitution of Organick parts, and the com∣mon Unity of parts alike, and not alike, called similar and dis∣similar parts.
THe natural Constitution of the Organick parts, * 1.1 consist •••• the due composition, and a convenient knitting of the 〈◊〉〈◊〉 milar parts into one form, fit and profitable for action for making up whereof these things ensuing are necessary.
First, * 1.2 a certain number of the parts compounding, whic•• in some are lesse, others more, according as the instrument are more or lesse compounded, till at length there is made up a perfect instrument, which can perform perfect actions.
Secondly, * 1.3 a due magnitude of the parts compounding, being neither bigger nor lesser then they ought.
Thirdly, * 1.4 due framing: which comprehends first a convenien•• figure; secondly, cavities and pores, that in case a part be no•• solid, but porous, it may contain the just number and magnitude of those pores; thirdly, a certain disposition of the secundary qua∣lities, namely, that some parts may have a sharp superficies, some parts light, others heavy, some soft, others hard, some coloured others not; light colour, or dark colour, according as the nature and use of the part requireth: * 1.5 Fourthly, situation and connexi∣on, that every part may be in its own place, and may agree with others. Lastly, it is requisite that there be a common unity, a•• well of parts alike, as disalike, which is a coherence and growing together of divers bodies into one; * 1.6 which if it be wanting and ta∣ken away, the natural action is hindred.