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While some consider that the quotidian tem¬ 
perature is due to the fact that the malignant tertian 
has a very variable period of development, viz., twenty- 
four to forty-eight hours, and, in fact, all intermediate 
times, others consider that with one generation of 
parasites there is a second accumulation of young forms 
in sufficient quantity to produce a quotidian attack. 
In quotidian fever, due to the malignant tertian 
parasite, the characteristic febrile attack, with its 
preliminary pseudo-crisis, is lost. The attack instead 
of lasting about a day lasts a few hours only, as in the 
simple tertian, and instead of a pseudo-crisis there is 
a true crisis, but the young parasites, as in the malignant 
tertian attack, are still coming into the circulation, and 
there follows a rise which replaces the apyretic day in 
the ordinary malignant tertian. 
According to Maurer, in the case of the quotidian 
chart produced by one generation of malignant tertian 
parasites we have the febrile attack produced by the 
division of the majority of the segmenting forms, and 
then a fall to normal occurs ; when, however, there is 
a sufficient accumulation of young forms arising from 
the same generation there is again a rise giving the 
quotidian chart. As we have seen, the young forms 
of the malignant tertian parasite persist during the 
pyrexia. If, however, by any means they are destroyed 
or cease appearing temporarily during the day of 
pyrexia, we should get a fall to normal, and then as 
soon as this inhibiting cause was removed, again a rise, 
giving a quotidian chart produced by the malignant 
tertian parasite. 
Irregular Temperatures 
Besides the typical malignant tertian temperature 
chart and the quotidian chart, various irregular tern- 
