THE PATHOGENIC HEMOSPORIDIA 



281 



also, that the cause of the pernicious type belongs to a different genus 

 from the others. There seems to be little justification for this increase 

 in number of genera, and I am inclined to follow Schaudinn, Craig, 

 and others in grouping all of the malarial parasites under the one 

 generic name of plasmodium. Associated with these different forms 

 of the organism there are three well-marked types of malaria, while 

 some observers, notably Craig and the majority of the Italian authori- 



FlG. Ill 



Temperature variations in tertian estivo-autumnal fever. 

 Fig. 112 



Temperature variations in quotidian estivo-autumnal fe\'er. 



ties, distinguish four such types. The essential features by which they 

 are distinguished are the differences in the rate of development as 

 measured by the time between successive pyrexial attacks. Tertian 

 fever, caused by Plasmodium vivax, is characterized by an attack every 

 forty-eight hours ; quartan fever, by an attack every seventy-two hours ; 

 estivo-autumnal or pernicious fever, by daily or more or less constant 

 fever. The significance of these attacks, first made out by Golgi in 

 1886, is that they coincide and are caused, therefore, by the sporulation 



