Medical Zoology

were sleeping; in these mosquitos were observed various stages of the development of the parasite. From such a study, considering the quantity of material used, we might expect, as indeed turned out to be the case, noteworthy results. Contemporaneously, mosquitos were studied, which were caught in stables and poultry yards, which, deriving their nourishment from the blood of birds and domestic mammals, could control to a certain extent the preceding observations. The other method was to follow the development of the parasites in Anopheles, which were made to sting the malarial patients in the hospital on fixed days and hours. They were systematically dissected day by day, and thus the regular development of the parasite was followed, whilst in other mosquitos which had not stung malarial patients and were held in the same conditions the parasites in question were not