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C. M. Jackson. 



in turn upon the growth, of their component organS). The relative 

 size of the principal organs in the specimens examined is given in 

 Table IV. In Table V the average relative size of the principal organs 

 is given for the various lunar months. In this table, all the available 

 data published in the literature have been utilized, measurements on 

 about 800 embryonic, fetal and newborn specimens being used. 



% 



Brain 



__ Lungs 



Heart 

 Spinal Cord 



^ E 



Lunar Months 



Fig. 3. Curves showing relative prenatal growth (percentage of the total 

 body weight) in the brain, spinal cord, liver, lungs and heart. Based upon 

 Table V, from all data available, grouped by months. The dotted lines on the 

 left indicate probable relations of the first month, as explained in the text ; 

 those on the right connect the data for still-born with the corresponding 

 figures for live-born. . • 



These include observations by Welcker and Brandt (45), Legou (25), 

 Faucon (15), Arnovljevic (3), Brandt (8), Anderson (2), Boyd 

 (7), Lomer (28), Meeh (31), Liman (26), Thoma (41), Oppen- 

 heimer (38), Miihlmann (36), Collin and Lucien (9), and Beneke 

 (4). A few cases, clearly either abnormal or erroneous, were exclu- 

 ded. In calculating the averages in Table V, the percentage of the 

 total body (weight) was reckoned separately for each specimen, then 



