JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org.. The American Society of Parasitologists is collaborating with JSTOR to digitize, preserve and extend access to The Journal of Parasitology.One cannot have experienced the war without having been impressed anew, and depressed, by the amount of parasitism in the world. Speaking helminthologically, it may be referred to as the grave host r6le which the lives of men play in the lives of worms. Or, think of it the other way about, for there is likewise the great parasitic role the lives of worms play in the lives of men. Back from the Pacific come a thousand-odd Americans with schistosomiasis, and a few times that many with filariasis, and several multiples more with ancylostomiasis (sensu strictu). To homes widely dispersed throughout the land go these exservice men, to live a lifetime in familiarity with the strangely sounding names of their distantly-acquired helminthiases.These observations suggest familiar concepts to the parasitologist. The One World of Wendell Wilkie that struck with the force of a new idea at the politicoeconomic level, is, of course, decades, and in some respects centuries old, to the student of disease-producing agents. However, each parasitologist is wont to live in his thinking in One World with the species which particularly interests him. There have been, therefore, only a few attempts to bring all species of major human concern into the short focus of a brief presentation. In the belief that there might flow from such renewed consideration certain emphasis useful to world citizens and in our science, this attempt at such a succinct statement has been made.Just how much human helminthiasis is there in the world?The bare mention of the question will make those of you with nosogeographical interests-or, better, helminthogeographical interestswarily scratch a mental ear and mull over a remark that ends "where angels fear to tread." If so you are doing furtively what I did openly and frequently in these last weeks, as the difficulties in the accomplishment of such a combined analysis and synthesis presented themselves. I need scarcely remind you of what some of those hurdles are: so many parasitological surveys of but small numbers of people, frequently of other design than to represent fair samples of an area, done by workers of varying aims and by techniques of even more variable efficiency in relation to the task at hand. Worse, at first sight, from a true census standpoint, is the fact that in order to gain a comprehensive perspective, examination results made at intervals over years have needed to be compressed as if made at a single recent point on the time scale, sometimes without full knowledge of what complicating or ameliorative factors had been in...

Broths in which the nematode Neoaplectana glaseri had develop axenically caused the mycelium of the predaceous fungus Arthrobotrys conoides to differentiate into traps. The active principle was extracted from worm-free Culture filtrates and named "nemin." The identity of nemin remains to be established.

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There have been described in detail adaptations of dilution egg counting and direct centrifugal flotation for use on sheep faeces for the ova of Haemonchus contortus, together with certain data on their comparative efficiency. It is suggested that extension of the methods as given, or with appropriate modifications, would permit studies from a variety of angles on the helminthic infestations of the gastro-intestinal tract and its diverticula among domestic animals.

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