. The Journal of hygiene . any hard and fast rule as to what absolutenumber of eosinophiles per cubic millimetre of blood should be regardedas pathological; still less therefore can one define the correspondingpoint in percentage figures. From general experience one is justifiedin regarding any figure under 5 as being normal, though somethingmust be amiss if a series of cases gives an average of 5 ; above10 one may say definitely that there is an eosinophilia. Between5 and 10 cases are much more doubtful. The figures broughtforward here indicate clearly that anything above 8
. The Journal of hygiene . any hard and fast rule as to what absolutenumber of eosinophiles per cubic millimetre of blood should be regardedas pathological; still less therefore can one define the correspondingpoint in percentage figures. From general experience one is justifiedin regarding any figure under 5 as being normal, though somethingmust be amiss if a series of cases gives an average of 5 ; above10 one may say definitely that there is an eosinophilia. Between5 and 10 cases are much more doubtful. The figures broughtforward here indicate clearly that anything above 8 is to be regardedwith suspicion, and seem to justify our placing the upper limit of thenormal at 7 or 8 This figure is also in accord with general experience, Journ. of Hyg. iv 30 454 A nJiylostomiasis though isolated cases of one sort and another have occuned in everyonesexperience in which an eosinophilia of this degree has been explicableon no known ground. I would propose therefore, for the present practical. Fig. 1. The ordinates represent the percentage frequency of occurrence of each percentageof eosinophiles in the two series, the abscissae the percentages of eosinophiles. Thecontinuous line represents infected, the interrupted line non-infected, miners. purpose, to regard any figure under 5 as normal, numbers between5 and 8 as doubtful, and any count of over 8 as extremely this basis the figures work out as follows:— No. of cases under 5 5—8 over 8 over 20 p c. Infected 148 3-4 2-7 93-9 33 1 Not infected 158 91-1 7-0 1-9 1-3 A. E. Boycott 455 If we make allowance on the one hand for those doubtful cases whichare reckoned as infected (group A ii. jB and 7, p. 441), and on the other, hand for the two cases of high eosinophilia among the non-infected group for which a definite cause {Ascaris infection) was found, thefigures become even more emphatic. And it is clear that the frequencyof an eosinophilia in thos
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