Eight Years' Wanderings in Ceylon

by Sir Samuel White Baker

Should this ever be experimented on, a question might arise of much interest to entomologists, whether a difference in the food of the spider would affect the quality of the thread, as is well known to be the case with the common silkworm.

A Ceylon night after a heavy shower of rain is a brilliant sight, when the whole atmosphere is teeming with moving lights bright as the stars themselves, waving around the tree-tops in fiery circles, now threading like distant lamps through the intricate branches and lighting up the dark recesses of the foliage, then rushing like a shower of sparks around the glittering boughs. Myriads of bright fire-flies in these wild dances meet their destiny, being entangled in opposing spiders' webs, where they hang like fairy lamps, their own light directing the path of the destroyer and assisting in their destruction.

There are many varieties of luminous insects in Ceylon. That which affords the greatest volume of light is a large white grub about two inches in length, This is a fat, sluggish animal, whose light is far more brilliant than could be supposed to emanate from such a form.

The light of a common fire-fly will enable a person to distinguish the hour on a dial in a dark night, but the glow from the grub described will render the smallest print so legible that a page may be read with case. I once tried the experiment of killing the grub, but the light was not extinguished with life, and by opening the tail, I squeezed out a quantity of glutinous fluid, which was so highly phosphorescent that it brilliantly illumined the page of a book which I had been reading by its light for a trial.

All phosphorescent substances require friction to produce their full volume of light; this is exemplified at sea during a calm tropical night, when the ocean sleeps in utter darkness and quietude and not a ripple disturbs the broad surface of the water. Then the prow of the advancing steamer cuts through the dreary waste of darkness and awakens into fiery life the spray which dashes from her sides. A broad stream of light illumines the sea in her wake, and she appears to plough up fire in her rush through the darkened water.

The simple friction of the moving mass agitates the millions of luminous animalcules contained in the water; in the same manner a fish darting through the sea is distinctly seen by the fiery course which is created by his own velocity.

All luminous insects are provided with a certain amount of phosphorescent fluid, which can be set in action at pleasure by the agitation of a number of nerves and muscles situated in the region of the fluid and especially adapted to that purpose. It is a common belief that the light of the glow-worm is used as a lamp of love to assist in nocturnal meetings, but there can be little doubt that the insect makes use of its natural brilliancy without any specific intention. It is as natural for the fire-fly to glitter by night as for the colored butterfly to be gaudy by day.

The variety of beautiful and interesting insects is so great in Ceylon that an entomologist would consider it a temporary elysium; neither would he have much trouble in collecting a host of different species who will exhibit themselves without the necessity of a laborious search. Thus, while he may be engaged in pinning out some rare specimen, a thousand minute eye-flies will be dancing so close to his eyeballs that seeing is out of the question. These little creatures, which are no larger than pin's heads, are among the greatest plagues in some parts of the jungle; and what increases the annoyance is the knowledge of the fact that they dance almost into your eyes out of sheer vanity. They are simply admiring their own reflection in the mirror of the eye; or, may be, some mistake their own reflected forms for other flies performing the part of a "vis-à-vis" in their unwearying quadrille.

A cigar is a specific against these small plagues, and we will allow that the patient entomologist has just succeeded in putting them to flight and has resumed the occupation of setting out his specimen. Ha! see him spring out of his chair as though electrified. Watch how, regardless of the laws of buttons, he frantically tears his trowsers from his limbs; he has him! no he hasn't!—yes he has!—no—no, positively he cannot get him off. It is a tick no bigger than a grain of sand, but his bite is like a red-hot needle boring into the skin. If all the royal family had been present, he could not have refrained from tearing off his trowsers.

The naturalist has been out the whole morning collecting, and a pretty collection he has got—a perfect fortune upon his legs alone. There are about a hundred ticks who have not yet commenced to feed upon him; there are also several fine specimens of the large flat buffalo tick; three or four leeches are enjoying themselves on the juices of the naturalist; these he had not felt, although they had bitten him half an hour before; a fine black ant has also escaped during the recent confusion, fortunately without using his sting.