part is to her liking, as is evidenced by the slow 

 opening and closing of the movable finger of the 

 claw corresponding with the side receiving my 

 caress. But her satisfaction soon manifests itself in 

 a most unmistakable way. When I transfer my 

 strokings or titillating touches to a segment of one 

 of her walking legs, this appendage is raised with 

 the very evident attempt to counter-resist the con- 

 tactual pressure of my hand. 



Another circumstance might well be added. To- 

 day Little Lena's solicitations of human attention 

 are such that the members of my family can 

 scarcely enter the laboratory without being com- 

 pelled to pet her. One's first duty on entering the 

 room is to pay one's respects to the crab. At an 

 earlier period there was some novelty in this; but 

 now, I fear, the pleasure first found in this peculiar 

 friendship has partly passed. As a result there are 

 times when these solicitations are not always imme- 

 diately met; but Little Lena patiently remains 

 near the surface until some one deigns to come — 

 lingering, often for hours, to receive her meed of 

 caressing in compensation for her climb . . . 



Now, the point is, can such examples of the 

 spider-crab's behavior be ascribed to instinct or to 



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