



334 O H tfo Construction of Kitchen Fire-places, etc. 



unassisted by science, may lead, and frequently does 

 lead, to useful improvements ; but the progress of such 

 improvement is not only slow, but vacillating, uncertain, 

 and very unsatisfactory. On that account, no doubt, it 

 is that men of science have in all ages been respected 

 as valuable members of society. 



