The dart apparatus, used during courtship in some groups of hermaphroditic land snails, has long been assumed to have a “stimulatory” effect on the mating partner, though how stimulation occurs and exactly what function it serves has never been determined. In this study, extracts of the mucous glands of the dart apparatus of the land snail Helix aspersa were injected into conspecifics and into ...

reproduced, Columbus's first sighting of America is a billboard boosting Ayar's Sarsaparilla. Certainly, quacks have always proved adroit at exploiting American sensibilities (angelic infants loom large) and pandering to particularly New World fears, not least that of growing old. Early this century, Duffy's Pure Malt Therapeutic Whiskey widely featured the 106-year-old Mrs Nancy Tigue of Lafay...

I N the last decade the theoretical consequences of the joint effects of recombination rate and fitness interactions between loci have been studied by KIMURA (1956, 1965) , KOJIMA (1959‘ a,b), LEWONTIN and KOJIMA (1960), LEWONTIN (1964 a,b.c), and FELSENSTEIN (1965). Several observations support the relevance of this body of theory to natural and laboratory populations. Non-random associaticins...

Members of genus Neotyphodium are asexual derivatives of sexual Epichloë species and maintain endophytic relationships with many cool-season grasses. Most Neotyphodium species analyzed so far are interspecific hybrids with combined or partial genomes of two or three ancestral species. In this study we characterized Neotyphodium isolates from Cinna arundinacea, a perennial cool-season grass from...