Observations on the ophthalmoscopic appearances of the eyes of the order of primates / by G. Lindsay Johnson.

  • Johnson, G. Lindsay (George Lindsay), 1853-1943.
Date:
[1897]
Catalogue details

Licence: Public Domain Mark

Credit: Observations on the ophthalmoscopic appearances of the eyes of the order of primates / by G. Lindsay Johnson. Source: Wellcome Collection.

Provider: This material has been provided by UCL Library Services. The original may be consulted at UCL (University College London)

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    [Fro)7i the Phocebdings of the Zoological Society op Loj^don, January 19, 1897.] Observations on the Ophthalmoscopic Appearances of the Eyes of the Order Primates. By G. Lindsay Johnson, M.A.,M.D., F.R.C.S., F.Z.S. (Plates Il.-VI.) Adopting the classification given in Sir W. Flower's classical work on the Mammals, I include in the order Primates: Man, Monkeys, Marmosets, and the suborder Lcmuroidea. I have found that a comparison of the ophthalmoscopic appearances of the fundus oculi of the various members of this most important order enables us to arrive at certain defmite conclusions, vrhich I believe to be of interest to zoologists. All the animals, including Man, were examined by me in a darkened room with the same amount and the same kind of illumination, and also with the same degree of magnification. Only animals in perfect health were selected, and, so far as possible, several animals of the same species were examined in order to preclude the possibility of abnormal fundi. Moreover, in all cases both eyes were examined and ascertained to be similar in all respects before a drawing was made. As a further precaution, each detail of the drawing as it was being painted by my artist, Mr. Head, was confirmed by myself in the living eye, and altered (if necessary) until it represented the original in all respects. As regards keeping the animals quiet, I found considerable difficulty at first, but as my experience increased the difficulties vanished. In no case was any drug or anjBsthetic used, but in tho case of a few of the wilder Monkeys a net was thrown over thera. In all the other cases the animal was held gently by the keeper in his lap. The animal rarely struggled, and usually became [1]