THE PROGRESS OF SCIENCE 



3°9 



of the sea life of our littoral waters, 

 but also of the delicately balanced and 

 interlocking associations of the animals 

 and plants composing it, the American 

 Museum of Natural History in New 

 York has been installing a series of 

 groups representing the actual condi- 

 tions under which this life occurs at 

 certain definite localities on the At- 

 lantic coast. Photographic and painted 

 transparencies are arranged to show 

 the surroundings at the locality in ques- ! 



tion while the animals and seaweeds are 

 represented partly by actual specimens 

 and partly by models colored from life. 

 The latest of these groups, as shown in 

 the accompanying photographs, repro- 

 duces the animal and plant colonies to 

 be found living below the low-water 

 mark on the wharf piles in the neigh- 

 borhood of Vineyard Haven, Massachu- 

 setts. The upper part of the group 

 represents an old abandoned wharf be- 

 tween the piles of which may be seen 



The pile to the left is covered with the tubes of serpulid worms, overhung by the 

 yellowish masses of the ascidian, Molgula. Starfishes, mollusks, barnacles, sponges, 

 sea-anemones and sis species of ascidians are seen on the central pile. 



