186 The Philippine Journal of Science 



This suggested evolution can be explained only on the basis 

 of the hypothesis that the infecting organism may have assumed 

 a cryptoplasmic state on adapting itself to animal parasitism, 

 followed by the invasion and utilization of the tissue cells, par- 

 ticularly the polymorphonuclears. 



The general hypothesis as outlined has been formulated as 

 a possible explanation of these and other more or less related 

 observations, which it is the intention to report in the series of 

 articles undertaken. 



