25o SCIENCE PROGRESS 



and cephalothorax, are about two millimetres long, and weigh 

 just a centigramme. First the eyes become visible as black dots, 

 and next the legs change to a greenish yellow. Later the 

 cephalothorax becomes yellowish brown, and the abdomen 

 dark green, with a lighter pattern of the same design as that 

 on the adult spider. Ultimately the colour becomes brown 

 and remains so. 



One reference to a half-finished investigation in conclusion. 

 Dr. A. H. Cooke, studying the attack on the mussel by a par- 

 ticular foe, found that the creature tended to plunge its weapon 

 into the most vital spot of its prey. This conclusion was 

 reached by accumulation of the pierced shells of the mussel. 

 The little that I was able to do at the end of last autumn seems 

 at present to render it quite possible that the spider, too, deals 

 the coup de grace to the trussed-up insect also in the most vital 

 spot. 



