114 



Disturbances of tie barometric pressure beyond the diurnal oscilla- 

 tions are rare, readings remaining constant for many weeks at a time. 



The air is extremely dry; steel articles left on the ground every night 

 do not rust, and no dew is deposited, notwithstanding the clear sky, ex- 

 cept at the bottom of ravines. 



Sumary of Temperatures in different places during 

 February, March, and April. 



LOCALITY. 



DATE. 



ELEVATION. 



HOUK. 



Temperature 

 Fahrenheit. 



f 



Coast, at Topolo- 



Jan. 31, 



30 feet, 



maximum day, 



62.°5. 



.3 



banipo, 







minimum night, 



47. 



d 





feb; 1, 



30 ,, 



maximum day, 



79. 5. 



a 









minimum night, 



47. 5. 



fee 



© 





Feb. 2. 



30 ,, 



maximum day, 

 minimum night, 



64. 

 37. 



" 



o 



Near river, 



"Feb. 5, 



55 ,, 



8 p. m., 



58.3 air. 



5 



San Bias, 



Feb. 7, 



120 , 



minimum night, 



40 in fog. 



1 ' 

 1 





Feb. 10, 

 Feb. 12, 

 Feb 12, 



180 ,, 

 250 ,, 



8 p. in,. 



8 a. m., 



9 p. m., 



55 air. 

 47. 5 air. 

 56. 7 air. 





Near river, 



u 



53 





Feb. 13, 



250 ,, 



8 p. in., 

 minimum night, 



53 air. 

 37. 



" 







Feb. 15, 



320 ,, 



8 p. m., 

 minimum night, 



50. 5 air. 

 39 . 





H 





Feb. 17, 

 March 25, 



384 ,, 

 384 ,, 



minimum night, 

 8 p. m., 



41 . 

 52 air. 





&£ 



'River valley, 



San Juan de Dios, . . 



Feb. 23, 



904 ,, 



8 a. m., 



61. 2 air, 



»v5 

 ST. ' 



Feb. 26, 



1135 ,, 



9 p. m., 



84. 5 air, hot 

 strongwind 













nil night. 



Y* «tH 



Old lake basin, 



Feb. 24, 



1010 ,, 



8 p. m., 



69 air. 





'Canon at Batopilas, 



March 1, 



2523 ,, 



10 p, m., 



76 air. 



ft ..; 





Marcn 5, 



' ,, 



8 a. m., 



64 air. 



o 



j! q rf 



March 6, 



2523 ,, 



8 a. m., 



62 air. 



*l 









maximum day, 



99. 5. 



d | 



Canon at Urique, ... 







minimum night, 



58. 





March 9, 



1790 ,, 



6 p. m., 



72 air. 









minimum night, 



62. 5. 





On cordon of mesa, 



March 10, 



6038 ., 



minimum night, 



39. 5. 







March 12, 



5950 ,, 



7 p. m., 



42 air. 





On foot lulls,. ..['... 



Marcli 15, 



2540 ,, 



minimum night, 



54. 







March 29, 

 April 2, 



3150 ,, 

 4950 ,, 



7 a. m., 



8 p. m., 



42 air. 

 49 air. 



On mesa, 







April 3, 

 April 4, 



5674 ,, 



8 p. m., 



45. 5 air. 







7265 „ 



8 p. m., 

 minimum night, 



54 air. 



38. 



" 







April 5, 



7199 ,, 



8 p. m., 

 minimum night, 



51 air. 

 19. 



i (Ojito de Baranca) 

 High mesa, 



^ 



April 6, 



7575 ,, 



8 p. in., 



38 air. 



To 









minimum night, 



13.: 



S 



Bocovna, 



April 7, 



7140 ,, 



8 p. m., 



38. 5 air. 







April8, 





minimum night, 



29. 





L " 



April 9, 



" 



minimum night, 



29. 



Ai 



* temperatures by swi 



ig thermomc 



ters (verinec 



at Kew), maxima 



in shade, 







minima expo 



sed to open s 



ky. 





