On one of the buildings I observed one of the most remarkable, largest, and most complete timepieces I had yet seen; and I had on this occasion an opportunity of examining it closely. The dial was oblong, enclosed in a case of clear transparent crystal, somewhat resembling in form the open portion of a mercurial barometer. At the top were three circles of different colours, divided by twelve equidistant lines radiating from the centres and subdivided again and again by the same number. Exactly at the uppermost point of each was a golden indicator. One of these circles marked the temperature, graduated from the lowest to the highest degree ever known in that latitude. Another indicated the direction of the wind, while the depth of colour in the circle itself, graduated in a manner carefully explained to me, but my notes of which are lost, showed the exact force of the atmospheric current. The third served the purpose of a barometer. A coloured band immediately below indicated by the variations of tint the character of the coming weather. This band stretched right across the face; below it were figures indicating the day of the year. The central portion of the face was occupied by a larger circle, half-green and half-black; the former portion representing the colour of the daylight sky, the latter emblematic of night. On this circle the Sun and the planets were represented by figures whose movement showed exactly the actual place of each in the celestial sphere. The two Moons were also figured, their phases and position at each moment being accurately presented to the eye. Around this circle was a narrow band divided into strips of different length of various colours, each representing one of the peculiar divisions of the Martial day; that point which came under the golden indicator showing the _zyda_ and the exact moment of the _zyda_, while the movement of the inner circle fixed with equal accuracy the period of day or night. Below were other circles from which the observer could learn the amount of moisture in the atmosphere, the intensity of the sunlight, and the electric tension at the moment. Each of the six smaller circles registered on a moving ribbon the indications of every successive moment, these ribbons when unrolled forming a perfect record of temperature, atmospheric pressure, wind, and so forth, in the form of a curve—a register kept for more than 8000 Martial years.