115 



Observations for latitude were made with a 6 inch sextant and co- 

 vered mercury trough. 



Heights were measured by boiling-point instrument with thermo- 

 meters verified at Kew ; and two aneroids. 



OBSERVATIONS OF LATITUDE MADE BY THE AUTHOR. 



The town of Puerte, 25° 30' 30" North. 



Agua Caliente de Baca 26 13 40 „ 



Rancho of Septentrion, 26 45 „ 



Santiago near Bahuina 27 30 „ 



Town of Cuiteco, 27 5 20, 



Ojito de Barranca at the bend of 



the Urique river, 27 13 40 „ 



Bocoyna on the Rio Conchos, 27 40 20 „ 



Note added in the Press. 



The Author's attention has been directed to the Bosquejo geol6gi- 

 co de Mexico, 1897, numbers 4, 5, and 6, which contain a general account 

 of the geology of Mexico, and some preliminary notes on the provinces 

 of Chihuahua, Sonora, and Sinaloa. 



(Reprinted ft-inn the Proceedings of the Royal Dublin Society, August 1899). 



BIBLIOGRAFIA. 



Bibliotbeque Technologique. Les Pb.6nomen.es electriques 

 et leurs applications. Etude historique, technique et economi- 

 que des transformations de l'euergie electrique par Henry Vi- 

 varez, aneien eleve de l'Ecole Polytechnique, Expert pres les 

 Tribunaux.— Paris, G. Carre et C. Naud. 1901. 8? 574 pages. 

 254 figs. 15 fr. relie. 



Nos parece que esta obra esta llamada a satisfacer a los deseos de mu- 

 chas personas, ingenieros, jefes de industrias, etc., que necesitan conocer 

 los principios generales de la Electricidad como los de la Pisica y la Meca- 



