546 Scientific Intelligence. 



position to-day more to Rosenbusch than to any other man, not 

 perhaps so much to his investigations and published writings, 

 though in these he has been excelled by none, as to his work and 

 influence as a teacher. A large part, possibly a majority of those 

 men, who as active workers during the past twenty-five years 

 have been pushing forward into this field of science, have 

 received more or less of their training in his laboratory and have 

 been inspired by his zeal and enthusiasm. As a well-deserved 

 tribute of honor and affection it will give not less pleasure to the 

 recipient and to many who will use it, than it will be of value as 

 a contribution to science. 



In this brief notice it would be impossible to give an adequate 

 review of the work, but the following brief summary of the table 

 of contents will give an idea of its scope and the list of contribu- 

 tors : Prof. Grubenmann, of Zurich, on glaucophane rocks ; Prof. 

 Hobbs on rocks of the Cortlandt series in Connecticut ; Prof. 

 Wuifing, Danzig, on mineral pigments ; Prof. Hlawatsch, Vienna, 

 on an amphibole from Portugal ; Dr. Hovey, New York City, on 

 the geology of a district in Mexico ; Prof. Miigge, Konigsberg, 

 on the action of HF1 on quartz ; Prof. Milch, Breslau, on differ- 

 entiation in a granite magma ; Prof. Koch, Berlin, on diabases 

 from the Hartz Mts. ; Dr. Daly, Ottawa, on a case of differentia- 

 tion in a magma ; Dr. E. Becker, Heidelberg, on the Wartenberg 

 in Baden ; Prof. Osann, Freiburg in Baden, on alkalic rocks from 

 Spain ; Prof. Palache, Cambridge, Mass., on titanium minerals 

 from Somerville, Mass. ; Dr. H. Preiswerk, Basel, on some dike 

 rocks from Piedmont ; Prof. Steinman, Freiburg in Baden, on 

 the origin of some copper ores in Bolivia ; Dr. Nicolau, Jassy, 

 Bucharest, on aragonite ; Dr. L. Finckh, Berlin, on rhombic 

 porphyry from Kilimandjaro ; Dr. W. Wahl, Helsingfors, on a 

 diabase from Aland Island, Finland. 



The volume is well printed and illustrated and is a handsome 

 specimen of the bookmaker's art. l. v. p. 



9. Evidence Bearing on Tooth-cusp Development ; by James 

 Williams Gidley. Proceedings of the Washington Academy 

 of Sciences, Vol. VII, pp. 91-106, pis. iv-v. — In connection 

 with the work of cataloguing the portion of the Marsh collection 

 of Mesozoic mammals contained in the U. S. National Museum, 

 Mr. Gidley has made some important discoveries bearing upon 

 the question of tooth-cusp homologies in the mammalian molars. 



The tritubercular theory proposed by Professor Cope and 

 developed by Professor Osborn accounts for the development of 

 the molar cusps in a manner at variance with that shown by 

 Scott to be true of the molariform premolars and contrary to the 

 evidence of embryology as set forth by Woodward, Tacker, and 

 others. Centetes, Ericulus, and Chrysochloris, wherein the embry- 

 ological evidence seemed to agree with the theory of the tritu- 

 berculists, are shown to have attained a secondary or pseudo- 

 tritubercular form by the reduction of the true protocone and 

 the fusion of the paracone and metacone into an apparent proto- 

 cone. 



