THE MASTERY UF THE AIR 265 
bright twilight I saw one of these animals run 
up a trunk in a rather open place, and then 
glide obliquely through the air to another tree 
on which it alighted near its base, and immedi- 
ately began to ascend. I paced the distance 
from one tree to the other, and found it to be 
not less than seventy yards, and the amount of 
descent I estimated at not more than thirty or 
forty feet, or one in five. This, I think, proves 
that the Colugo must have some power of 
guiding itself through the air, for otherwise 
in so long a distance it would have little 
chance of alighting exactly on the trunk.” 
An interesting point in regard to these 
parachuting mammals is that there are so 
many which seem to be independent of one 
another. It is worth while making a technical 
list, because it shows how the same impulse 
must have become urgent over and over again. 
Perhaps to be ranked 
GALEOPITHECUS ; among the I[nsectivores. 
Among the rodents, re- 
ANOMALURUS . 
2 lated to squirrels, but 
PETAURISTA . differing markedly from 
ScIUROPTERUS 8 : 
one another. 
Peraurus . . . .( All of them Marsupials, 
PETAUROIDES . . but not nearly related 
AEROBATES to one another. 
