352 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 83 



glass, reading the measurement on a standard scale ; ' and of taking 

 the maximum breadth of the tooth with the blunt extremities of a 

 sliding compass, the latter well tested as to accuracy. 



In the case of the third molar which lacks the posterior contact 

 facet and in all other cases where the contact facet is missing or dis- 

 placed, the length is measured to where the upper edge of the facet 

 would normally be if it existed. In the case of teeth presenting 

 peculiar conditions the worker must use his trained common sense. 



Under these conditions results are obtained, particularly as to the 

 length, that do not vary on repeated measurements more than, at most, 

 two-tenths of a millimeter. With all due care, however, measure- 

 ments on some teeth have to be repeated several times until the 

 observer is fully satisfied as to the results. Such minutiae are quite 

 necessary when dealing with the teeth of smaller primates or with 

 teeth of such importance as those of fossil anthropoids and early man ; 

 and they are indispensable when studying the relations of the teeth 

 in the two sexes, on the two sides, or among themselves in the same 

 individual. 



The human teeth that were measured or remeasured included the 

 following : 



The lower molars of the Piltdown Jaw — British Museum of Natural History ; 

 The Mauer Jaw — Geologisch-Palaeontologisches Institut, Heidelberg; 

 Two jaws of Ehringsdorf — Stadtisches Museum, Weimar; 

 Le Moustier youth — Museum fiir Kunstgewerbe, Berlin; 

 Spy skeletons — at the home of Professor Maximin Lohest, Liege ; 

 Krapina remains — Narodni Muzej, Zagreb; 



Aurignacian remains of Pi'edmost — The Provincial Museum (of Natural His- 

 tory), Brno; 

 H. anrignaccnsis Hauseri — Museum fiir Kunstgewerbe, Berlin; and 

 The Chancelade skull — Museum of Perigueux, France." 



In addition to the preceding, various specimens were seen that on 

 account of wear could not be measured, or that were too far from 

 man and the upper apes to be of much use in this connection. 



Por which the rod of the sliding anthropometric compass is quite useful. 

 ^ The teeth of La Ferrassie and La Quina alone could not be measured. The 

 former are still under study by Dr. Boule ; the dimensions of the latter are given 

 by Dr. Henri Martin in his L'Homme fossile de La Quina, Paris, 1922. 



