Thaddy, the chief observer, was down with a slight fever.  His assistant, Woodhouse, paused for a moment in silent contemplation of the tropical night before commencing his solitary vigil.  The night was very still.  Now and then voices and laughter came from the native huts, or the cry of some strange animal was heard from the midst of the mystery of the forest.  Nocturnal insects appeared in ghostly fashion out of the darkness, and fluttered round his light.  He thought, perhaps, of all the possibilities of discovery that still lay in the black tangle beneath him; for to the naturalist the virgin forests of Borneo are still a wonderland full of strange questions and half-suspected discoveries.  Woodhouse carried a small lantern in his hand, and its yellow glow contrasted vividly with the infinite series of tints between lavender-blue and black in which the landscape was painted.  His hands and face were smeared with ointment against the attacks of the mosquitoes.

Even in these days of celestial photography, work done in a purely temporary erection, and with only the most primitive appliances in addition to the telescope, still involves a very large amount of cramped and motionless watching.  He sighed as he thought of the physical fatigues before him, stretched himself, and entered the observatory.

The reader is probably familiar with the structure of an ordinary astronomical observatory.  The building is usually cylindrical in shape, with a very light hemispherical roof capable of being turned round from the interior.  The telescope is supported upon a stone pillar in the centre, and a clockwork arrangement compensates for the earth’s rotation, and allows a star once found to be continuously observed.  Besides this, there is a compact tracery of wheels and screws about its point of support, by which the astronomer adjusts it.  There is, of course, a slit in the movable roof which follows the eye of the telescope in its survey of the heavens.  The observer sits or lies on a sloping wooden arrangement, which he can wheel to any part of the observatory as the position of the telescope may require.  Within it is advisable to have things as dark as possible, in order to enhance the brilliance of the stars observed.

The lantern flared as Woodhouse entered his circular den, and the general darkness fled into black shadows behind the big machine, from which it presently seemed to creep back over the whole place again as the light waned.  The slit was a profound transparent blue, in which six stars shone with tropical brilliance, and their light lay, a pallid gleam, along the black tube of the instrument.  Woodhouse shifted the roof, and then proceeding to the telescope, turned first one wheel and then another, the great cylinder slowly swinging into a new position.  Then he glanced through the finder, the little companion telescope, moved the roof a little more, made some further adjustments, and set the clockwork in motion.  He took off his jacket, for the night was very hot, and pushed into position the uncomfortable seat to which he was condemned for the next four hours.  Then with a sigh he resigned himself to his watch upon the mysteries of space.