/A r a; A"/ 7;/ >• AM VAN. w i\n(f\\ ai^ai rs 4.S 



a(iuatir. 'I'lu' third model i> of tlic ;i(liill male iii().s(|iiiio which is h;iciiil('ss 

 since it lu^xcr l)itcs 111:111. The t'oiirlh model shows the luhill hiii.de mos- 

 (jiiito in tlic attitude of l)itiiiu'. In auotlicr case is a series of iiKxh'ls show inu- 

 tile life cycle of the malarial ^■enii in tiie hhxxl of man and in the moscinito. 

 In se\ei-al of the alcove windows are habitat ^r()ui)s of invertel)rates 



illustrating the natural histoi'v of the comuiouei' aud moi-e 

 Window • 1 • 1 



^ t\pica.! ainmals. 



Groups • * 



In the Annulate Alcove is show 11 the Marine W'orui 



Group reprodueing tlies(^ animals with their associates in their natiu'al 



surroiuulings, as seen in the harbor of Woods Hole, Mass. The harbor 



and the distant view of Woods Hole village with the U. S. Fish Gomniission 



buildings are shown in the background, represented by an enlarged colored 



photographic transparenc\'. In the foreground the shallow 

 Marine Worm ^ i> ^1 i 1 \\ \ • ^ 1 • . • 



^ water 01 the harbor near the shore is represented in section 



to expose the animal life found on muddy bottoms among 

 the eel-grass, as well as the chimneys of various worm-burrows. In the 

 lower part of the group a section of the sea bottom exposes the worms 

 within the burrows. Several species of these are represented. [See Reprint.] 

 In the Mollusk Alcove window is shown the natural history of a sand- 

 spit at Cold Spring Harbor, Long Island, including some of the shore 



mollusks and their associates. The entrance of the harbor 



is seen in the distance. In the foreground at the edge of 

 Qj.Q the sand-spit a mussel-bed is exposed by the receding tide 



over which fiddler-crabs are swarming into their burrows. 



Beneath the water surface an oyster is being attacked b}' a star-fish, while 



crabs and mollusks of ^•arious species are pursuing their usual activities. 



The window group in the Vertebrate Alcove shows the piles of an old 



wharf at Vinevard Haven, Mass. Below the low-tide 

 Wharf Pile * . 



P mark the submerged piles are covered with flower-like 



colonies of in\'ertebrate animals. xAmong these are sea- 

 anemones, tube building worms, hydroids, mussels, sea mats and several 

 kind of ascidians or sea-squirts. The latter are primitive members of the 

 Chordate group which includes the vertebrates. Like the embryo of man, 

 they possess during their larval period a chorda or cartilaginous spine. At 

 first they are free swimming but later in life many of their organs degenerate 

 and they become fitted to a stationary mode of life. [Sec Reprint.] 



Other exhibits illustrate certain facts made clear by Darwin. On the 

 right and left of the entrance variation under domestication is 

 illustrated by dogs, pigeons, and domesticated fowls, the wild 

 Domestication species from which they have been derived being shown in com- 

 pany with some of the more striking breeds derived from them. 

 The struggle for existence is portrayed by the meadow mouse, sur- 

 Struggle for rounded by its many enemies and yet continuing to main- 

 Existence tain an existence by virtue of its great birth rate. 

 [Return to the elevators.] 



