ULY II, 19 1 8] 



NATURE 



interfered with by reflections from the glass fronts 

 of the cases. A window, or a Hght floor, or a 

 white dress may be reflected so distinctly that 

 these objects appear superposed on the exhibit, 



cases for the habitat groups are arranged against 

 the walls and are lighted by large skylights, while 

 the central part of the hall is provided with sky- 

 lights of a smaller size, so calculated as to reduce 



Fig. ^.— Californ 



Desert Bird Group. .Mu.-.euin of the CalirornU Academy of Sciences. 



and it is often difficult, or even impossible, to 

 obtain a satisfactory- view of the specimens in the 

 case owing to this cause, particularly when the 



the illumination of objects'in the space frequented 

 by visitors to an amount which will give rise to 

 no reflections strong; cnou^'h to obscure the ob- 



-BlackMie.ii (i'rsiis aim 



all'i/rpntaiis). M useuin of the California Academy of Sciencts. • 



( Li inspected has a black surface, which emits 

 lew light-rays that it is overpowered by the 

 onger reflections seen in. the mirror-like front 

 the case. To avoid these inconveniences, the 

 NO. 2541, VOL. lOl] 



jects in the exhibition cases. This is substan- 

 tially the method which has long been in use for 

 the exhibition of living animals in aquaria. Suit- 

 able arrangements are provided for reducing the 



