66 WHAT IS LIFE ? 



ever-changing living molecules, 1 called the human 

 being, can be so constituted as to be able to produce 

 instruments invented by many minds, which prove the 

 above formula of formulae that it is true. 2 



1 "A proteid molecule is very large, and composed of a large 

 number of atoms of C. 0. H. N. ; these may 'hold hands' so to 

 speak, in many different ways ; the molecule, while forming part of 

 protoplasm, may take many shapes, may offer many kinds of oppor- 

 tunities for different kinds of chemical intercourse. It is to this, 

 character that the proteid molecule owes its preponderating import- 

 ance in living matter ; the molecule, while in living matter, is ' all 

 alive' the seat and centre of an active commerce of atoms." (" An 

 Introduction to Human Physiology," A. D. Waller, M.D., F.R.S., 

 1896, p. 6.) 



2 This has been the experimental effort of the author in his work, 

 " What is Heat ? " Nature never disappoints the formula ; at least, 

 that is the author's experience. 



