4,715 Result(s)
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Chapter
Schmeckstoffe und Riechstoffe
Die Schmeckstoffe sind zumeist löslich und bei gewöhnlicher Temperatur nicht flüchtig, die Riechstoffe flüchtig und im allgemeinen nicht löslich. So kommt es, daß die Riechstoffe gewöhnlich nicht schmecken, un...
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Chapter
Der Geruch schmeckbarer Riechstoffe bei Anosmie
Unter den Schmeckstoffen beanspruchen diejenigen ein erhöhtes Interesse, die löslich, zugleich leicht flüchtig sind und überdies noch einen Eigengeruch besitzen, so daß die Qualität ihres Geruches als Geschmac...
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Chapter
Einleitung
Die Wissenschaften haben sich dem Studium der verschiedenen Funktionen der Mundhöhle, im besonderen demjenigen der objektiven funktionellen Prüfung der Zunge, in geteiltem Maße zugewandt. Die eine Leistung der...
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Chapter
Der Geschmack riechender Schmeckstoffe bei Ageusie
In folgerichtiger Anwendung des Gesetzes von der spezifischen Energie der Sinnesnerven muß, wenn man Seh- und Hör-Nerven durchschnitte und übers Kreuz verheilen ließe, d. h. Sehnerv mit Hörnerven und Hörnerv m...
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Chapter
Die Prüfung des Geschmackssinnes
Die Methodik der physiologischen und auch der pathologischen Untersuchung des Geschmackssinnes ist bisher in recht geringem Maße behandelt und wenig vervollkommnet worden. Vintschgau1), Zwaardemaker2) und Nagel3)...
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Male and Female — Young and Old
As far as we can tell at present, no appreciable racial differences in olfactory acuity exist nor are there marked unacquired differences between normal persons and those, otherwise normal but deprived of sens...
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Chapter
Concluding Note
It may possibly be thought strange that more has not been said in this book about the modern, very powerful techniques — various forms of chromatography and spectrometry, for example — now being increasingly a...
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Chapter
Historical
Perhaps the first treatise on odours is that of Theophrastus who wrote his Concerning Odours in the second or third century B.C. He maintains that odours “are due to mixture for anything which is uncompounded has...
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Chapter
Wheresoever the Carcase Is
The olfactory powers of dogs are not disputed — not so those of birds1. When Audubon “contradicted all former opinions on the subject” in Edinburgh in 1826, he did so with uneasy feelings expecting to encounter v...
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Chapter
Savage and Blind
There is a widespread belief that primitive peoples and blind persons (or, at least, persons born blind or blinded while young) naturally have a particularly acute sense of smell. Some travellers have even cla...
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Chapter
The Brave Smell of a Stone
Since it seems certain that volatile material only can be smelled, an explanation must be found for the fact that many non-volatile substances undoubtedly appear to emit odour. It is said, for example, that so...
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Chapter
Some Curiosities
Robert Boyle’s gloves were not the only historical objects which were remarkable for the tenacity with which they retained their odour. There were also, for example, the documents of Albrecht von Haller (1708–...
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Chapter
Introduction
How long a period of time has elapsed since the primate stock substituted sight for smell as the dominant sense we do not know, but it is certainly a very long time. Some investigators believe that this substi...
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Epilogue
«Quand je commençai de tracer ces lignes, je méditais une grande oeuvre d’art et de science à la fois. J’eusse montré le culte des parfums chez les peuples les plus reculés, leur histoire et les milles secrets...
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Chapter
Dog’s Life
The olfactory powers of some animals have naturally attracted considerable, if usually casual, attention and scientific studies of olfaction in various species have been conducted from time to time. Accurate o...
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Chapter
Fishes that Tipple in the Deep
Mammals living in water (e. g., dolphins, porpoises, seals, walruses, whales) have poorly developed olfactory organs and are said, although the evidence appears to be scanty, to have an extremely poor sense of sm...
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Chapter
Law and Order
Although the Weber-Fechner law, namely the rule that the increase of stimulus required to produce a just appreciable increase (the “just noticeable difference”) in sensation must always bear the same ratio to ...
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Chapter
Physiological Mystery
The theories of olfaction have certainly been incomplete and rather unsatisfactory. Some of them are largely speculative. Others are philosophical, dealing with perception rather than sensation. But it is no long...
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Chapter and Conference Paper
Metarhodopsin III
The photic isomerization of rhodopsin is followed by a number of dark reactions (1) some of which are also photosensitive (2). Information is available on their various half- lifes, which, as expected, vary wi...
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Chapter and Conference Paper
Interrelations of Visual Pigments and “Vitamins A” in Fish and Amphibia
In frogs and fish, although perhaps not in mammals (1, 2), the pigment epithelium plays a decisive role in visual pigment regeneration (see Baumann, 3, for review). This is illustrated in Fig. 1 for Rana clamitan...
