especially those relating to contact, light 

 and colours. 



" This scheme of the immateriality of 

 matter, as it may be called, or rather, the 

 mutual penetration of matter, first occurred 

 to Mr Michell on reading Baxter On the 

 Immateriality of tlie Soul. He found that 

 this author's idea of matter was, that it 

 consisted, as it were, of bricks, cemented 

 together by aq immaterial mortar. These 

 bricks, if he would be consistent to his 

 own reasoning, were again composed of 

 less bricks, cemented, likewise, by an 

 immaterial mortar and so on ad infantum. 

 This putting Mr Michell upon the con- 

 sideration of the several appearances of 

 nature, he began to perceive that the 

 bricks were so covered with this im- 

 material mortar, that if they had any 

 existence at all, it could not possibly be 

 perceived, every effect being produced, at 

 least in nine instances in ten certainly, 

 and probably in the tenth also, by this im- 

 material, spiritual and penetrable mortar. 

 c. 81 



