Statistics of variations : with remarks on the use of this method in anthropology / by Thomas Dwight.

  • Dwight, Thomas, 1843-1911.
Date:
[1895]
Catalogue details

Licence: Public Domain Mark

Credit: Statistics of variations : with remarks on the use of this method in anthropology / by Thomas Dwight. 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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    Classified according to Sex. Male Right Number. Artery in front. Nerve in front. 155 66 = 42,5 01 10 70 = 45,1 o/ 32 = 23 „ Lett 139 84 = 60,4 yy Total 294 150 = 51 yy 102 = 34,6 „ Female. Right 71 27 = 38,3 01 10 38 = 35,5 % 17 = 23,6 „ Left 72 49 = 69,4 yy Total 143 76 = 53,1 yy 55 = 38,4 „ Mixed. 19 = 12,2 0 /0 11= 15,1 „ 40 = 13,6 „ 5 = 7 o/o 1=4,1 „ 8 = 5,5 „ Male Femal Total Male Femal Total Classified according to Side. Right. No artery. 0 1= 1,4 °j0 2 = 0,6 „ 1 = 1,4 o/Q 1=4,1 „ 4 = 2,7 „ 155 66 = 42,5 % 70 = 45,1 01 1 o 19 = 12,2 0/ 0 71 27 = 38 „ 38 = 53,5 yy 5=7 ft 1 = 1,4 °/0 226 93 = 41,2 „ 108 = 47,7 yy 24 = 10,6 yy t- o,4:: Left. 139 84 = 60,4 °/0 32 = 23 01 1 o 21 = 15,1 01 2 = 1,4% 72 49 = 68 „ 17 = 23,6 yy 3 = 4,1 yy 3 = 4,1 „ 211 co CD II co co r—< 49 = 23,2 yy 24 = 11,3 yy 5 = 2,3 „ The difference between the sexes is of no great importance. What is of most value is that on the left the artery is in front in nearly two thirds of the cases, and on the right in less than half. How to deal with the mixed cases, that is to say those in which the artery has a branch on each side of the nerve, and, more raresly when the nerve has a branch on each side of the artery, is very perplexing. I have adopted the principle of ignoring minute branches. If the smallest twigs were always counted the number of mixed cases would be much greater. It may be noted that the artery is absent only once on the right side and five times on the left. The Division of the Abdominal Aorta. Males Females Opposite 3 Lumbar Y. 7 = 3,2 0/ ft 2 = 2 Disc between 3rd & 4th 6 = 2,7 1 VJ j y 5 = 5,1 4th Lumbar Y. 164 = 75,9 yy 74 = 76,2 Disc between 4th & 5th 11=5 8 = 8,2 5th Lumbar V. 28 = 12,9 yy 8 = 8,2 Total 216 97 Total 9= 2,8% 11 = 3.5 „ 238 = 76 „ 19= 6 „ 36 = 11,5 „ 313 Of the 238 cases in which the division occurred opposite the fourth lumbar vertebra, in 50 it was at the top of the vertebra, in