Helminthology Asmund Rudolphi, Otto Friedrich Bernhard von Linstow and Johann Gottfried Bremser started systematic scientific studies of the subject. The Japanese parasitologist Satyu Yamaguti was one of the most active helminthologists of the 20th century; he wrote the six-volume "Systema Helminthum". Helminthology Helminthology is the study of parasitic worms (helminths), while helminthiasis describes the medical condition of being infected with helminths. Helminthology studies the taxonomy of helminths and their effects on their hosts. The origin of the first compound of the word is the Greek "ἕλμινς" - helmins, meaning "worm". In the 18th and early 19th century there was wave of
Creatures (video game series) which the creature may choose to obey. The player cannot force creatures to do anything. The player is represented by a disembodied hand in the world, and the hand can attempt to teach creatures by tickling them as a reward or punishing creatures by slapping them. (For "Creatures Village", aimed at very young players, tickling is done by a feather wand, and punishment is represented by a squirt bottle.) Older norns can also teach concepts to younger norns. Norns may also express to the player how they are feeling. The language aspect was incorporated to promote a relationship between norns