The administration of nitrous oxide and oxygen for dental operations / by Frederick W. Hewitt.

  • Hewitt, Frederic W. (Frederic William), Sir, 1857-1916.
Date:
1901
Catalogue details

Licence: Public Domain Mark

Credit: The administration of nitrous oxide and oxygen for dental operations / by Frederick W. Hewitt. Source: Wellcome Collection.

Provider: This material has been provided by the Augustus C. Long Health Sciences Library at Columbia University and Columbia University Libraries/Information Services, through the Medical Heritage Library. The original may be consulted at the the Augustus C. Long Health Sciences Library at Columbia University and Columbia University.

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    mixtures containing 7, 8, or 9 per cent, were best for females and children. The accompanying chart shows the com- parative general results obtained by {a) pure nitrous oxide, [b) nitrous oxide mixed with different percentages of air, and [c] nitrous oxide mixed with different percentages of oxygen. The chief objections to the use of definite mixtures of nitrous oxide and oxygen are: (i) That they are difficult to prepare with accuracy and in sufficiently large quantities; {2) that different subjects require different percentages ; and (3) that the proportion of oxygen cannot be increased or decreased to meet special conditions arising during the ad- ministration. At the same time, it is important to have a clear idea of the effects produced by different proportions of oxygen, in order that we may correctly understand all the phenomena which may arise during the use of varying per- centages of the two gases by means of the apparatus to be presently described. A word of caution is perhaps necessary with regard to keeping nitrous oxide and oxygen together, in gasometers, for any length of time. Hillischer states that traces of the higher oxides of nitrogen were detected, at the end of a week, in a mixture which had been kept in Ludwig's laboratory. The two gases should therefore be mixed as required.