326 • Scientific Intelligence. 



on about the center of the twenty-eighth lot of the sixth conces- 

 sion of the township of Thurlow, Hastings County, in the province 

 of Ontario. This meteoric iron, which would appear to have 

 been brought to the surface by ploughing, is described by Dr. 

 Hoffmann as an irregularly-shaped, truncated pyramidal mass, 

 with a more or less rectangular base, measuring 16 by 13'5, or 

 including an elongated projection, 17 centimeters, in its diameters, 

 and 10 centimeters in height; its weight is 5-42 kilos. The 

 entire surface is pitted, and coated with a chestnut-brown, 

 slightly glimmering, film of oxide of iron. 



5. Observations on Popocatepetl and Ixtaccihuatl ; by Oliver 

 C. Farrington. Field Columbian Museum. Publication 18, 

 Geol. series, vol. i, No. 2, pp. 71-120, pis. vii-xviii, 1897. — In 

 this brief account of a personal examination of this interesting 

 geological region Dr. Farrington has given a vivid description of 

 the geographic and geologic features of the mountains, perfect- 

 ing his sketch by reference to particulars recorded by previous 

 observers, and illustrating the paper by numerous reproductions 

 of photographs. h. s. w. 



6. L. Evolution regressive en Biologie et en Sociologies par MM. 

 Jean Demoor, Jean Massart et Emile Vandernelde, pp. 

 1-324, figs. 84, Paris, 1897. (Bibliotheque scientific internationale, 

 Felix Alcan.) — The authors, being specialists in the fields of biol- 

 ogy and sociology, have combined forces to discuss the analogies 

 between the phenomena of "regression" in the evolution of 

 organism and regression in society. They conclude that the 

 transformations of organs and of institutions are always accom- 

 panied by regression, that regressive evolution is irrevertible and, 

 consequently, with a few exceptions, is more or less final (?iettes), 

 and that regressive evolution is caused by limitation of the means 

 of subsistence — food, capital or the forces of labor, etc. The book 

 is modern and full of suggestive thoughts, both for the biologist 

 and for the student of social problems. h. s. w. 



7. The Birds of Colorado ; by W. W. Cooke. 141 pp. Fort 

 Collins, Colorado (The State Agricultural College, Agricultural 

 Experiment Station, Bulletin No. 37). — This pamphlet gives a 

 list of the birds of Colorado, so far as identified up to the pres- 

 ent time, with notes on their distribution, habits of migration, 

 etc. The State is unusually rich in number of birds, more so 

 than any other in the Union except Nebraska. A complete bib- 

 liography of Colorado ornithology is given in pp. 20 to 39. 

 Copies of this publication may be obtained free of charge by ad- 

 dressing the Director of the Experiment Station at Fort Collins. 



8. The Mammoth Cave of Kentucky : an illustrated Manual j 

 by Horace C. Hovey and Richard Ellsworth Call. 107 pp. 

 1897. Louisville, Ky. (John P. Morton & Co.) — Future visitors 

 to the Mammoth Cave will be glad to have in hand this full and 

 well-illustrated guide book to that most interesting locality. 



