MUSEUM OF COMPARATIVE ZOOLOGY. 27 



Vertebrate Footprints on Carboniferous Shales of Plainville, Mass. 

 Bull. Geol. Soc. Am., Vol. XL 1900. pp. 449-454. 



Glacial Origin of the Older Pleistocene in Gay Head Cliffs, with note 

 on Fossil horse of that section. Bull. Geol. Soc. Am., XI. 1900. 

 pp. 455-460. 



(With G. C. Curtis) Nantucket: A Morainal Island. Journ. Geol., 

 Chicago, Vol. VII. 1899. 230-236. 



Also reviews in Science. See also under N. S. Shaler. 

 By R. C. Daly. 



On the Optical Characters of the Vertical Zone of Amphiboles 

 and Pyroxenes ; and on a New Method of Determining the Ex- 

 tinction Angles of these Minerals by means of Cleavage Pieces. 

 With 3 plates. Proceedings of the American Academy of Arts and 

 Sciences, Vol. XXXIV., No. 12. February, 1899. pp. 311-323. 

 XXII. 1899. (Translated in Bull. Soc. Franc. Mineral., XXII. 

 1899.) 



A Comparative Study of Etch-figures. The Amphiboles and Pyrox- 

 enes. Proceedings of the American Academy of Arts and Sciences, 

 Vol. XXXIV., No. 15. March, 1899. pp. 373-429. (Translated in 

 Bull. Soc. Franc. Mineral., XXII. 1899.) 



On a New Variety of Hornblende. Proceedings of the American 

 Academy of Arts and Sciences, Vol. XXXIV., No. 16. March, 1899. 

 pp. 433-437. 



Three Days in the Caucasus. Acta Victoriana. Toronto, May, 1899. 

 pp. 481-493. 



Palestine as Illustrating Geological and Geographical Controls. Bull. 

 Amer. Geogr. Soc, Vol. XXXI., 1899, pp. 444-458, and Vol. XXXII., 

 1900, pp. 22-31. 



The Russo-Siberian Plain. Acta Victoriana. Toronto, 1899. Re- 

 printed in the Journal of School Geography, Vol. IV. 1900. pp. 

 81-90. 



The Calcareous Concretions of Kettle Point, Lambton County, On- 

 tario. Journ. Geol., Vol. VIII. 1900. pp. 135-150. 



Also reviews in American Naturalist, Journ. Geol., and Science. 

 By T. A. Jaggar, Jr. 



Death Gulch, a Natural Bear-Trap. Appleton's Popular Science 

 Monthly. February, 1899. 



Experimental Investigation of the Formation of Minerals in an Ig- 

 neous Magna: a review. Journ. Geol., Vol. VII., No. 3. April- 

 May, 1899. pp. 300-313. 2 plates. 



The Laccoliths of the Black Hills, by T. A. Jaggar, Jr., with a 

 chapter on Experiments Illustrating Intrusion and Erosion, by Ernest 

 Howe. XXI. Ann. Rept. Director U. S. Geol. Survey. 



