374 Memorias de la Sociedad Científica 



like the preceding, from the Report o£ ^r. Puga show the 

 same result. 



iltitudes. Locations HoDtbs(1897)^ 



feet. May, Jun. July. Aujust. Septem. 



7381 9 México [Cent. Met. Ob.]. 0.7.')1 inch 5.47 inch 5.08 iuch 6.05 inch 5.28 inoh 



7611 5 Tacubaya [Astr. Observ.J 1 141 5.35 4 37 5.55 6.46 



7710.0 ürbina [Station of M. N. 



R. a.] 0.93 6.57 4.41 5.79 4.45 



9186.3 San Bartolito 6.50 5.99 



9448.8 El Contadero 3.27 6.97 6.22 7 24 



9055.1 Huisquilucan 2.40 8.27 7 08 8.74 5.17 



9709.7 Salazar 9.41 6.34 



9530.2 San Pedro Atlapulco 7.40 7.40 



9153.5 Chimalpa 9.09 



From tliese data and other special studies, Mr. Puga has 

 deduced the annnal average which corresponds to the quan- 

 tity o£ rain which normaly falls in the S.W. of this Valley, 

 finding this average equal to 33.465 inch ( 850 milimeters ) 

 that is to say 10.551 inch (2G8 miHmeters) more than in the 

 capital. 



Although in one sense the abundance o£ rain in this re- 

 gión of the Valley tends to augment the relative quantity of 

 moisture, the same does not take effect with the whole quan- 

 tity of vapor in suspensión in atmosphere. Evaporation is al- 

 ways found in relation with the atmospheric pressure, which, 

 when it is least, brings, as a consequence evaporation more 

 rapid the quicker drying of bodies, greater cutaneous and 

 pulmonary evaporation. 



These last influence in a direct and undeniable man- 

 ner the concentratiou of the blood in the inhabitant of these 

 hills. 



This fact, the concentratiou of the blood, influencesin such 

 a marked manner human physiology and consti tutes one 

 of the most powerful factora against the developement of tu- 



(1) In the year 1897, the rainfall was exceptionaly abundant (Puga's 

 note.) 



