CHANGES DURING PREGNANCY 



519 



phosphorus, calcium and magnesium actually present at given times 

 in the fertilised ovum, i.e. the fetus with adnexa, and also the 

 amounts which have been retained per week by the fertilised ovum. 



Bar 1 has calculated the following figures for the human fetus 

 without adnexa. 



Period. 



Till 4 months - 

 During 4th month - 



5th - 



6th 



7th 



8th and 9th months 



Daily N 

 Requirement. 



0-0013 gm. 



0-042 



0-155 



0-166 



0-198 



0-945 



The additional energy requirements have been determined by 

 Murlin 2 for the pregnant dog and by Carpenter and Murlin 3 for 

 the human subject. In a bitch weighing about 14 kg. during sexual 

 rest the following figures were obtained during two different preg- 

 nancies three days before birth. 



1 Paul Bar, J^econs de L'atholofjie obstetrical'', vol. ii., Paris, 1907 (Asselin et 

 Houzeau, editeurs). 



. - Murlin, ''Energy Metabolism of the Pregnant Dog," Amer. Jour, of 

 I'/itfsioL, vol. xxvi., 1910. 



3 Carpenter and Murlin, " Energy Metabolism of Mother and Child just 

 before and just after Birth," Archives of Int. Medicine, vol. vii., 1911. 



