1^8 Of the Advancement of Learning, Lib. IV. 



fparkje and caft forth a light : Which is likewife feen in the fervent 

 froath of the Sea which they call the Sea-longf. And what affinity 

 with flame and fired matter have the CicinduU, the LucioU, and the 

 Indian fly^ which caft a light over a whole arched R.oom j or the eyes 

 ofcertain living Creatures in the dark, and Sugar.as it is grated or bro- 

 ken 5 or the fweat of a horfe hard ridden , in a fouitry night 5 and 

 many more ? N^^, many have undcrjiood fo little in this pointy as many 

 have thought the fparkj from a fit nt to be attrited Air. But when the 

 Air is not fired with heat, and apparently conceives Light, how comes 

 it topafs, that Owls and Cats , and many other Creatures fee in the 

 night ? So that it maji needs he (feeing vifion cannot be conveyed mthont 

 light") that there is a native and inbred light in Air, although very feeble 

 and vpeak_j yet fiich as may be proportioned to the Optic^ Beams of fttch 

 Creatures, andmayfufice them for fight. But the caufe of this tv\\, as 

 of many more , that men have not drawn forth the common Forms of 

 things Natural , from particular Injiances , which is that we have fet 

 down as the proper fubjeft of Metaphyfick.'-, which is it felfapartof 

 Thyfick^j or of the knowledge of Nature. Therefore let there be enquiry 

 made of the Form and Originals of Light, and in thefciean time, it may- 

 be placed among Deficients. And thus much of the Knowledge con' 

 cerningthe fubjiance of the Soul^ Rational and Senfible^ with their Facvl- 

 ties,and of the Appendices ohhe fame Knowledge, 



THE 



