Mat 22, 1914] 



SCIENCE 



759 



There there is adequate provision for technical 

 training, secondary and higher training for 

 every child who shows any special gift for 

 taking advantage of it, and I consider that 

 this fact is a greater menace to our trade than 

 any arrangements of tariffs." 



At Cornell University Assistant Professors 

 O. A. Johnson and M. F. Earrus have been 

 promoted to full professorships in the depart- 

 ment of entomology and the extension depart- 

 ment of plant pathology, respectively. 



At Hamilton College Professor Nelson 

 Clark Dale, assistant professor of geology at 

 Princeton University, will succeed Professor 

 W. J. Miller, who goes to Smith College. 



Mr. C. G. Darwin, eldest son of the late 

 Sir George Darwin, has been appointed mathe- 

 matical lecturer at Christ's College, Cam- 

 bridge. 



DISCUSSION AND COBSESFONDENCE 



TWO UNDESCRIBED SPECIMENS OF OASTOROIDES 

 OHIOENSIS FOSTER FROM MICHIGAN 



There are two specimens of Castoroides 

 ohioensis in the collection of the museum of 

 geology. University of Michigan, that were 

 found in the state and have not been recorded. 

 One of these was discovered near Owosso, 

 Shiawassee County, in December, 1892, by 

 A» G. Williams. It is represented by the base 

 and upper part of the right mandible with the 

 incisor and all of the molar teeth in position, 

 the base of the left mandible, and the left 

 incisor tooth. The incisors are well pre- 

 served and show the longitudinal striae and 

 cutting edge, but the tip and base of each are 

 broken. The row of molar teeth is 75 mm. 

 long. 



The second specimen, a skull without the 

 mandibular bones, was exhumed in a tamarack 

 swamp in Pittsfield township, Washtenaw 

 county, by J. B. Steere, in 1902. It was lying 

 on a bed of gravelly marl and beneath three 

 feet of peaty soil. The skull is hard, of a rich 

 dark brown color, and is little damaged. The 

 left zygomatic arch is broken, and the teeth, 

 with the exception of the last molar on the left 



side and the right incisor tooth, are missing. 

 Nearly the full length of the right incisor is 

 represented, the only damage to the tooth being 

 an injury to the outer surface and the loss of 

 a few millimeters from the base. The double 

 nature of the internal nasal orifices is well 

 shown. The measurements are as follows: 



Mm. 

 Length of skull from occipital angle to 



forward end of nasals 280 



Length of skull from occipital angle to 



forward end of maxillaries 293 



Width of skull across occiput 168 



Width of skull across zygomatic arches. 230 



Height of skull at occiput 68 



Height of skull at last molars 98 



Length of nasals 116 



Greatest dimensions of zygomatic arch. . 67 X 115 



Width of occipital foramen 36 



Length of molar tooth row 73 



The writer is indebted to Professor E. C. 

 Case, of the department of geology, Univer- 

 sity of Michigan, for permission to publish 

 these records. 



Norman A. Wood 

 Museum op Zoology, 

 University op Michigan 



SCIENTIFIC BOOKS 



Outlines of Ghordate Development. By Wm. 



E. Kellicott. New York: Henry Holt & 



Co. 1913. 



In this volume Professor Kellicott endeavors 

 to give a compact though comprehensive ac- 

 count of the development of the Chordates, 

 such as will be suitable for the student of 

 general embryology. Eor this purpose the 

 frog is talien as representing the type, or 

 rather, one should say, the mean, of chordate 

 development, and a full and connected account 

 is given of its early development and organ- 

 ogeny. This account is, however, preceded by 

 an excellent statement of the embryology of 

 Ampliioxus, the author believing that whether 

 or not this represents a truly primitive type of 

 development, " it affords, in simple diagram- 

 matic style, the essentials of early Chordate 

 development," while its specialized later stages 

 " may serve to put the student upon his guard 



