372 Momorian do la Sociedad Científica 



town of Gruadalupe. By the facts thus obtained during the 

 month of July, 1895 he found — "that the average temperatu- 

 "re is greater in Guadalupe, less in México, and even less in 

 "Eslava. Therefore, Guadalupe is warmer than Eslava and 

 "than México, but on the contrary the variations of tempe- 

 "rature, from the morning to the afternoon are much more 

 " considerable in Guadalupe than in the other two points. The- 

 "se oscillations are represented approximately, thus: 7? 3 

 "for Eslava, 7? 8 for México and 11? for Guadalupe. In gene- 

 '*ral the climate of Eslava and we ought likewise to include 

 "all the montaneous regions to the S. W. is colder, daraper, 

 "an less variable than that of the capital. (^ ) 



In order to complete these meteorologicalfacts of so much 

 importance we have personally taken some observations 

 in the villages in the S.W. of the Valley: Sn. Nicolás "La 

 Magdalena" Chichicaspa, & which confirm Doctor Altamira- 

 no's observations. 



At the same time we have consulted this cuestión relati- 

 vo to the hydrology of these regions in the Report of Bel- 

 tran and Puga, which gives us the following data. 



There are two periods of rain in the Valley cf México 

 one of them takes place in Spring the other from the Sumner. 

 In the first period the rains neai'ly always come from the SW., 

 in the second they come from the N.E. and pass to the S.W. 



The first period is less abundant than the second even 

 when it is more usual that the first has more violent rainfalls, 

 in the month of February to April. 



The second constitutes the realrainy season. It commen- 

 ces regularly in the month of May af ter a short interval which 

 separates it from the preceding and in this interval are 

 observed the highest temperatures of the year — These tem- 



(3) Eeport to the Secretary of Fomento by the Director of the Me- 

 dical National lastitution, Dr. Altainirano. "Upon certain excursions to 

 the mouutains of "Ajuaco" and ranges of "Las Cruces." 



