An interpretation of some differences in the percentage of water found in the central nervous system of the albino rat and due to conditions other than age / Henry H. Donaldson.

  • Donaldson, Henry Herbert, 1857-1938.
Date:
1911
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Licence: In copyright

Credit: An interpretation of some differences in the percentage of water found in the central nervous system of the albino rat and due to conditions other than age / Henry H. Donaldson. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    Reprinted from The AN INTERPRETATION OF SOME DIFFERENCES IN THE PERCENTAGE OF WATER FOUND IN THE CENTRAL NERVOUS SYSTEM OF THE ALBINO RAT AND DUE TO CONDITIONS OTHER THAN AGE HENRY H. DONALDSON The Wistar Institute of Anatomy and Biology There are now available ten different series of observations bearing on the problem of variation in the percentage of water in the brain and spinal cord of the albino rat when subjected to unusual conditions. Nine of these series have been already pub- lished. The differences or variations which have been found are in most cases slight, in one instance only being more than 0.5 per cent. Differences of this order would usually be classed as errors of observation, but the regularity of their occurrence in some instances leads me to think that at times they are really significant. The present paper gives a brief survey of the results so far obtained, noting those cases in which the differences, though slight, seem to be significant, and attempting to offer an explana- tion for them. As the investigations which will be discussed are, with one exception, already in print, it will be unnecessary to repeat in the present paper many details which have been already given in the published articles. In the first instance attention is called to a difference in the percentage of water which is mainly of technical interest and which depends on the effect of the interval between death and dissection. This matter has been studied by Dr. King (’ll). THE JOURNAL OF COMPARATIVE NEPHOLOGY, VOL. 21, NO. 2