444 : General Notes. 
height, as, for example, Nevado de Famatina (6,024 metres) and 
Nevada de Aconquija (5,400 m.): toward the south these Pampas 
sierras diminish in height. 
The province of Santa Fe (Argentine Republic), according to the 
-census of June 8, 1887, now contains 220,332 inhabitants, against 
187,000 in 1869. The municipality of Cérdoba, a square of 26 
kilometres on each side, contained in October of the same year 
66,247 souls, while in 1869 it had but 34,458. Buenos Ayres has 
now a population of 424,873, and Rosaria 50,914. 
GEOGRAPHICAL NeEws.—ALGERIA.—The last census (1886) of 
Algeria gives a population of 3,752,196, being an increase of nearl 
half a million above the population in 1881. Of this increase 
24,209 are Frenchmen, and nearly 22,000 natives of other Euro- 
‘pean countries. There has been an influx of more than 17,000 
Moroccans into Algeria, while Mohammedan-French subjects have 
‘increased from 2,842,497 to 3,264,481. 
According to Mr. N. J. Dixon, the population of the various 
States of Colombia is as follows: Boyaca, 483,874; Cauca, 435,- 
690; Santander, 423,427; Cundinamarca, 409,602; Antioquia, 
365,974; Bolivar, 300,000; Tolima, 230,821; Panama, 220,600 ; 
-and Magdalena, 85,255; making a total of 2,955,243. 
GEOLOGY AND PALZONTOLOGY. 
Norges oN THE ROCKFORD SHALES.—The lithological and 
paleontological characters of the Rockford shales of Iowa differ 
-considerably at different localities. 
or example, the shales which are seen at the south exposure at 
Owens Grove, Cerro Gordo county, differ conspicuously, in many 
respects, in their lithological and paleontological characters, from 
the same beds observed at other localities! The differentiation of 
the fauna at this place is strongly marked. The three species O 
Pachyphyllum? which occur at Hackberry and Rockford, are here 
replaced by a new species of this genus. 
1 For a detailed description of the Rockford Shales, and the limestone 
which immediately underlie them, reference may be made toa paper 
by the author, on ‘‘Contributions to the Knowledge of the Devonian 
Fauna of Iowa, with a Description of the Rockford Shales,” now in 
press by the Davenport Academy of Science. 
2 In a paper, now in the hands of the printer, the author has described 
‘three new species of this genus. 
