Computed from observations made at the following places, viz. :

City of Mexico, by Louis Berlandier, for 92 days in summer and 95 in autumn, during transient sojourns in the city, in the years 1819 to 1825, and by Prof. L. C. Ervendberg, during the first eleven months of 1856. The latter were reported to the Smithsonian Institution.

Cordova, by J. A. Hicto.

Frontera Tabasco.

Vera Cruz, by officers of the Medical Department of the United States Army from June, 1847, to August, 1848, inclusive, except February; and by an observer whose name is not preserved, from August to December inclusive in 1856, and during the months of May, 1857. The latter observer appends a note saying that "the winds recorded in the column headed N. W. were generally N. N. W.," and, therefore, in preparing the following table they were distributed equally between. the columns headed North and N. W.

Mazatlan, Mexico, 42 days in January and February, 1848.

Minatitlan, Mexico, 12 months in 1858 and 1859.

Mirador, Mexico, 12 months in 1858 and 1859.

San Juan Bautiste, Mexico, 12 months in 1858 and 1859.

Truxillo, Honduras, by E. Purdot, July to December inclusive, 1854.

Computed from observations for an average period of nearly seven years, collected and classified, from the logs of numerous sailing vessels, at the United States Naval Observatory, under the direction of Captain M. F. Maury, Superintendent.

Observed at the following places, viz. :

Timbuctoo, in Soudan, where René Caillie experienced a prevalence of easterly winds during the month of May, 1822.

Dongola, Ebou Egli, Qoubouchi, Assour, Ras el Gartoum, and the intervening regions in Nubia, between the parallels of latitude 15° and 20° north, by Frederick Cailliaud, from January 11 to June 4, 1821, and from May 1 to 17, 1822.

Massowah and vicinity in Northern Abyssinia, by Rev. H. Hunter, for 42 days in the year 1778, and at the residence of M. W. Munzinger, in Massowah, from February to September inclusive in the year 1864.

Oasis Kauar, date not preserved, by Gerhard Rohlfs.

Red Sea, by Rev. H. Hunter, between the parallels of latitude 15° and 20°, for 24 days in the year 1778.

Computed from observations for an aggregate period of 13 years, collected and classified from the logs of numerous sailing vessels, at the United States Naval Observatory, under the direction of Capt. M. F. Maury, Superintendent.