24 
JOUKNAL OF MAMMALOGY 
With the exception of the missing teeth, two insignificant chips from 
the posterior margin, and the anterior margin of the mandibular sym- 
physis, the jaw is complete. If we may rely upon the legend accom- 
panying the figures in Sellard’s paper (no measurements are given), 
the present jaw is somewhat larger than his specimen, since it measures 
21.5 cm. from the middle of the broken first dental fossa in a straight 
line to the posterior margin of the jaw, and the height from the tip of 
the coronoid process to the lower margin of the mandible is 14.8 cm. 
Departmeiit of Biology, Texas Agric. and Mech. College, 
College Station, Texas. 
JACKING IN EAST INDIAN JUNGLES 
By Harky C. Raven 
Shortly after my arrival in eastern Dutch Borneo I was introduced to 
the sport of ‘‘jacking,” that is, hunting by night with a reflector lamp. 
At Samarinda I became acquainted with Mr. W. C. C. Olmeyer, whose 
father’s deeds, by the way, furnished Joseph Com:ad the plot for his 
novel “Almeyer’s Folly.” To shoot the shy sambur deer at night was 
one of Mr. Olmeyer’s hobbies. I soon realized that this method of pur- 
suit in the dead of night offered splendid opportunities to the naturalist. 
He who confines his activities to the day time faces a well nigh impos- 
sible task to gather first hand information about the habits of many 
animals, for in these tropical jungles few of them are seen by even the 
keenest observers. After dusk, however, the hunter, armed with a 
reflector lamp, can approach the shyest as well as the most dangerous 
of animals with little trouble. The glare of the light directed at their 
eyes renders him completely invisible to them. 
One night Mr. Olmeyer had heard that a “musang,” a species of 
viverrid, had been killing fowls in a neighbor’s coop. He proposed 
that I join him in hunting the offender. At about eight o’clock we 
set out, my companion carrying his reflector lamp and armed with a 
shotgun. Before starting he showed me how brightly the eyes of 
animals appeared by flashing the light at the cats and dogs about the 
place. Their eyes glistened like balls of fire but could only be seen by 
those close behind the lamp, for the reflection from the eyes of an ani- 
mal is straight back towards the source of light. 
Within less than ten minutes we found the “musang” stealing noise- 
lessly towards the chicken coop. Out of the forest, only a couple of 
hundred yards from the house, it stealthily passed along the ditch 
