448 C. G. MACARTHUR AND E. A. DOISY 



DESCRIPTION OF MATERIAL 



Dr. H, Gideon Wells, of the Pathological Department of the 

 University of Chicago, very kindly arranged to help us in this 

 investigation. Without his cooperation, this series would have 

 been very incomplete. 



Upon receipt of a brain the meninges and blood were removed 

 from the brain and it was divided into forebrain, cerebellum, and 

 brain stem, and each division weighed. Samples were then 

 taken and placed in enough 95 per cent alcohol to make the con- 

 centration 85 per cent alcohol. The specimens were as follows: 



Three-month fetus. Male. Two three-month fetuses, referred to as 

 normal, were united in order to furnish material enough for one good 

 analysis. These brains were not divided into forebrain, cerebellum and 

 brain stem. 



Seven-month jetus. Female. The mother of this stillborn fetus entered 

 the hospital five days before the dehvery with signs and symptoms of 

 placenta praevia. A brain of this age also give^ too small amounts if 

 separated into divisions, so such separation was not made. 



One-month child. Male. This child died of bronchopneumonia. The 

 forebrain was separated from the rest of the brain, the cerebellum 

 and brain stem were analyzed together because there was not enough 

 in either to make a satisfactory separate analysis. 



Three-month child. Male. Died of bronchopneumonia and marasmus. 



Eight to twenty-jour month child. Male. Though there was no record 

 of this child having been abnormal, the brain was found to be decidedly 

 underweight for the two-year age reported. The child may not have 

 been two years old, but younger. More Hkely it was subnormal. 



Twenty-one year adult. Male. Died of pneumonia. The autopsy 

 did not take place for three days after death, but the weather was cool, 

 so the brain was in good state of preservation when received. 



Thirty-three year adult, (negro). Male. Died of acute pneumonia. 

 No other disease was present. 



Thirty-five year adidt (Hungarian). Male. Cause of death not re- 

 ported. Brain was very high in solids, but not pathological in any 

 evident way. 



Sixty-seven year adult. Male. Died of tuberculosis. 



The weights of the different divisions obtained from these 

 brains were as follows : 



