WHOLE VOL. NOTES. SOUTH AMERICA JI 



the values until November 1897, subsequent means up to 

 November 1901, when the series apparently terminated, being 

 given in the publications of the above mentioned observatory 

 in four issues of " El Ano Meteorologico," by P. Juan de 

 Dios Moratoria, for the years 1897-1898, 1898-1899, 1899- 

 1900, and 1900-1901, Montevideo 1899 to 1902. The year 

 terminates in November, so that there is an overlap of 1 1 

 months between the two series Colegio Pio de Villa Colon 

 and the Prado. 

 Pressure. 



The elevation of the barometer as stated was 59.3 m, and the read- 

 ings were not at Lat. 45°, and so to make the two series 

 comparable, the monthly means were corrected to a height 

 of 29.3 m after having the gravity correction —0.7 applied. 

 The readings were made at 7 11 , I4 !l , and 2i h , and the correc- 

 tions to reduce to the mean of the day were deduced from the 

 Prado pressure data 1902-1915 given by Luis Morandi in 

 " Resumen y Discusion de las Observaciones Meteorologicas 

 del Observatorio Central, Periodo 1901-1915," Montevideo, 

 1 91 7. The corrections are as follows: 



Temperature. 



The temperature data, being deduced from the formula £(7 h + 

 I4 h + 2i h ), were corrected to the mean of 24 hours to 

 which the values previously published refer (see p. 1142 of 

 vol. 79, Smithsonian Misc. Coll.) by the following correc- 

 tions deduced from Morandi's memoir as follows: 



°c. 



During the first 11 months of 1901, where there is an over- 

 lap between the series, the mean temperature (24 h mean) 

 of the Colegio differed from that of the Prado by the follow- 

 ing amounts : 



Jan. Feb. Mar. Apr. May June July Aug. Sept. Oct. Nov. Mean 

 °C. -0.2 -0.1 -0.5 +0.1 -0.1 -0.1 +0.3 +0.4 +0.1 -0.2 0.0 



From these figures there is little to be inferred, so that no 

 correction has been made for local surroundings, the means 

 as observed being entered in the table. 

 Precipitation. 



During the n months January to November 1901 the rainfall 

 amounted to 678 mm at the Prado and to 845 mm at the 

 Colegio, or 12.5 percent more, so that the Colegio values 

 must be treated as a separate series. 



