542 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. .X.XXI. 



CRANIAL CAPACITY. 



The crjinial cavity appears to have reached the luiiit of its expansion 

 in nearly all the specimens, so that it is not necessary to exclude more 

 than one (Cat. No. 142171) from comparison. 



The method used in determining the capacity was that described b}" 

 the writer on a former occasion," and the results correspond closeh' 

 with the absolute volume of the cranial cavity. To insure accuracy 

 four determinations were made on each skull. The results were as 

 follows: 



Cranial capacity. 



In Cat. No. 1-12184, the skull of the adolescent orang, the sex of 

 which is doubtful, the capacit}^ is 450 cc. 



The writer searched the literature for other determinations of this 

 measurement and found a number of records, which it will be of inter- 

 est to introduce here for comparison. The capacities were olitained 

 by different but related methods, and are capable of collation. 



Former measureinenU of cranial capacity 'niftdl-gnnvn oran<ji<^ ii'itJi 

 known sex: 



Lucae,'* two adult males; in one "the cranial cavity takes 12 ounces," 

 the other "not quite 12 ounces," of millet seed. 



Owen, R.,'' one adult male, 26 cubic inches; one adult fcMiiale, 24 

 cubic inches. 



Lucae,^ 1 orang-, probably adult, 450 cc; 1 orang, adult, 420 cc; 1 

 orang, adult, 370 cc ; 1 orang, adult, 360 cc. ; 1 orang, adult, 335 cc. 



Duvernoy,'' one orang, adult, 475 cc. ; one orang. adult, 460 cc. 

 . Krauss,^ one orang, adult, 480 cc. 



« A Modification in Measuring Cranial Capacity, Science, n. s., XVII, pp. 1011-1014, 

 June 26, 1903. 



''J. Ch. G. Lucae, Der Pongo — und der Orang — Schiidel in Bezug auf Species und 

 Alter, Auftr. d. Senckenberg. naturf. Gesellsch., F. Tiedemann gewidmet, 10 ]Marz, 

 1854, pp. 154-167. 



'Trans. Zool. Soc, London, IV, 1862, p. 86. 



