FORMS OF LIVING-MATTER UNITS 107 



to be one of the earliest steps in morphology, al- 

 though the actual stages of production are at 

 present as inscrutable as are the marvellous 

 " karyokinetic processes ' we have of late years 

 recognised as ultimately destined to take place in 

 such bodies of a more developed order in which 

 definite nuclei exist. 



It is true that in Bacteria, and even in the 

 Torulae that are so constantly to be found in the 

 experimental solutions, no definite nuclei are re- 

 cognisable, still in these latter, under cultiva- 

 tion, vacuoles and even rudimentary nuclei show 

 themselves (see Plate 1, Fig. 7). 



While these are the most common forms of 

 organisms met with in the solutions, other new 

 or less familiar forms are encountered at times, 

 as well as bodies concerning which it is difficult 

 to say whether they are or are not living organisms. 



