DoNALDSON AND Davis, Human Spinal Cord. 39 
was no increase in their relative complexity; a result, which, 
to say the least, was unexpected. 
On comparing the curves for the areas of the cord at 3% 
years (curve E), with the composite curve for the adult, in or- 
der to determine the change in the form of the cord due to 
growth, several important differences appear. In the child’s 
cord, the total areas of the sections are of course less than in 
the adult; the greater deficiency appearing in the substantia 
alba. In the child’s cord, the intumescentiae are developed 
more abruptly than at maturity, and the maximal areas appear 
further caudad; yet, despite this, the sums of the total areas 
in the cervical and lumbar portions of the cord have almost the 
same relative values (see Table IX). The most marked de- 
ficiency in the child’s cord appears in the areas of the first three 
segments of the cervical region and especially in that of the 
third cervical segment, while the entire thoracic region is less 
developed than it will be at maturity. On the other hand, the 
sacral region is arrested in its later growth and becomes rela- 
tively smaller. 
BIBLIOGRAPHY. 
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Untersuchungen iiber den Bau des menschlichen Riickenmarkes mit 
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(2) WoROSCHILOFF: 
Der Verlauf der motorischen und sensiblen Bahnen durch das Lenden- 
mark des Kanninchens. SBerdchte berate Verhandlungen der Koniglich 
Sachsischen Gesellsch. der Wissenschaften zu Leipzig. Bd, 26, 1874. 
(3) STILLING, B: 
Neue Untersuchungen iiber den Bau des Riickenmarkes. Casse/, 1859. 
(4) Kapyi, H: 
Ueber die Blutgefasse des menschlichen Riickenmarks. Lemberg, 1889. 
(5) RUpDINGER, T: 
Atlas der peripherischen Nervensystems der menschlichen Kérpers 
Stuttgart, 1872. 
(6) Litperritz, C: 
Ueber das Riickenmarkssegment. Ein Beitrag zur Morphologie und 
Histologie des Riickenmarks. Archi f. Anatomie u. Entwickelungs- 
geschichte. Anat. Abtheil. Jahrgang, 1881. p. 423-495. 
