_These are the_ winter _months; and the number of times that the wind has been found to blow from the several points of the compass, in the winter months, is entered in the space between the two_ outer _circles. The radii show the points of the compass; the figures between the radii show the number of times, for each month, the wind has been timed to prevail from such points for as much as eight hours together. Thus, between the two heavily drawn radii opening to the North, the winds from N. by W. to N. by E. are entered as North winds. Between the right hand line of these two and the broken radius to the right of that again, the winds between N. by E. & N.E. by N. are entered as winds from N.N.E. Between this broken radius and the next one on the right are the winds from N.E. and so on, with the sun, around the sixteen points of the compass. All the winds between N. by W. and N. by E. are called North winds; those between E. by N. and E. by S. are entered as from E. & so on._ _Referring again to the same square, and to the two heavily drawn radii opening to the North, the numbers 20, 8, 16, between the two outer circles, mean, that 20 of the 294 winds in Dec, 8 of the 217 in Jan, and 16 of the 161 in Feb. were North. In Dec, the winds blew also 36 times from N.N.E; 37, N.E; 51, E.N.E; 60, E; 21, E.S.E; 17, S.E; 10, S.S.E; 6, S; and so on._ _Proceeding towards the centre, the next inter-circular space contains the winds, according to their direction, for the three spring months. The figures in the S.E. corner of the circumscribed square show the total number of winds recorded for each month, as 159 for March; 227 for April, and 301 for May, exclusive of 4, 5, 12, calms in the S.E. quadrant for the same months, and so on, around with the sun, for calms and number of winds, in the order of the months; beginning with the first number in the N.E. corner and quadrant, as the total winds and calms for December, the 2ⁿᵈ numbers for January and so on._ _The third space between the circles contains the winds for the three summer months in the same order, June, July and August, between the radii. The space between the two inner circles is for Autumn; the outer round of figures being the winds for Sept, and the inner for Nov. Diagram A is referred to for further explanation. In it the months are written instead of the number of winds and calms for each month and point of compass._ _The method, in which the number and direction of the winds have been ascertained, is this: As many logs as could be obtained have been examined; the 24 hours have been divided into three parts of eight hours each; and, according to the square in which the vessel was, the_ prevailing direction _of the wind for every eight hours has been entered as one wind_.