WHAT IS PHYSICAL LIFE 



cause marbles which show no traces of 

 them prove on examination to have been 

 subjected to far fiercer heat than that 

 which would consume the remains of or- 

 ganisms in kiln-baked brick. This heat 

 may have been engendered in many cases 

 by the violent crumpling up of rocky 

 strata during great movements of the 

 earth crust, thus changing the original 

 limestone deposits into veins of marble. 



But elsewhere limestone proves on ex- 

 amination to be a very curious thing, full 

 of minute holes which are really where lit- 

 tle canals have been cut across, and which 

 canals cannot possibly be of mechanical 

 origin, for no mineral grains can be made 

 to take such lines. Instead it is now 

 demonstrated that it is all done by an ani- 

 mal organism which, when first identified, 

 was imagined to fulfil all the conditions for 

 a beginning of unorganized life, and there- 

 fore was called sarcode. A particle of this 



