260 IN BRIGHTEST AFRICA 
where we can say without reservation that our prep: 
arations are permanent, permanent to a degree only 
dreamed of within the last twenty years, we feel justi- 
fied in taking extreme measures to insure the future 
care and preservation of these preparations. The 
elephants and rhinos can be made as permanent as 
bronze for endurance under all conditions, but the 
other animal groups with their backgrounds and with 
accessories necessarily made largely of wax cannot 
be thus exposed. That they shall not suffer from 
excessive light and from changing atmospheric con- 
ditions, they will be placed in two great alleyways 
on either side of, but practically outside, the hall, her- 
metically sealed off from the hall proper and also from 
the outside atmosphere. Thus each group will be abso- 
lutely protected from changes in temperature and hu- 
midity. Each group will be in fact within an individ- 
ual compartment, and allowed to “breathe” only the 
air of the alleyway, which is filtered and dried and 
kept at a uniform temperature throughout the year. 
Artificial light will be used for these groups. 
The amount of light required on them will be rela- 
tively small because of the fact that they are to be 
viewed from a relatively dark central hall. We shall 
be looking from the hall into the source of light 
rather than from the source of light outward. Also, 
reflections can be reduced to a minimum and practi- 
cally eliminated, owing to the fact that the groups are 
the source of illumination, by having the glass in the 
front of the case inclined at such an angle that it re- 
flects only the dark floor. 
