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XII. Tables of the Weights of the Human Body and Internal Organs in the Sane and 
Insane of loth Sexes at various Ages, arranged from ^ost-mortem examinations. 
By Eobeet Boyd, M.B., F.B.C.P.L., Physician to the Somerset County Lunatic 
Asylum. Communicated by Br. Shakpey, Sec. B.S. 
Eeceived February 7 , — Bead February 28, 1861. 
These Tables have been compiled from notes of 2086 examinations made at St. Mary- 
lebone Infirmary, between 1839 and 1847 ; and of 528 examinations in cases of insanity 
made at the Somerset Lunatic Asylum, between 1848 and the end of December 1860, 
comprehending in all a period of twenty-one years. The calculations alone have been 
the laboirr of many months ; a task, which, owing to the pressure of daily duties in a large 
estabhshment, I could not now have completed but for the able assistance of my relative 
Major Boyd. 
The Tables are submitted with a hope that they may aid in forming a standard of the 
weight of the human organs from early infancy to old age. The cases are arranged at 
eighteen periods of life, under eighteen different heads, showing the average height and 
weight of the body (the measurement of the head, and weight of the spinal marrow in 
No. 2), the average weight of the encephalon and its several parts ; also of each lung, 
of the heart, and of all the abdominal viscera. The assigned causes of death are given 
in the margin ; also the variations in weight of the lungs, heart, and liver. 
2 L 
ilDCCCLXI. 
