126 



Scientific Proceedings (53). 



A frog's leg was tied tightly and amputated above the ligature. 

 The second leg of the same frog was skinned and the skin filled 

 with a 0.7 per cent. NaCl solution and tied at the same level as the 

 first leg. The two legs were weighed, placed in water, and weighed 

 at intervals to determine the water absorbed. The leg filled with 

 NaCl solution absorbed water more rapidly than the other leg. 



An amputated and ligatured leg was placed in 0.7 per cent. 

 NaCl. Its weight remained constant. 



The ratio of the skin areas of a whole frog except the head, 

 to the hind legs below the knees, was found to be about 3.5. Two 

 frogs of the same size were selected. The hind legs of one were 

 tied just above the knees and amputated above the ligatures and 

 placed in water. The other frog was put in a harness that kept 

 the head out of water, and a canula with rubber bag attached 

 was inserted into the cloaca. This experiment was repeated a 

 large number of times. The water absorbed by the whole frog 

 within 6 hours was always more than 3.5 times as much as that 

 absorbed by the two hind legs. The water absorption for longer 

 periods of time is being studied. 



Conclusion. — The swelling of frog's legs, in which the circula- 

 tion of the blood is stopped, may be accounted for by osmotic 

 pressure. 



83 (779) 



The dynamics of a model of cell division. 



By J. F. McClendon. 



[From the Department of Anatomy, Cornell University Medical 

 College, New York City.] 



A low beaker is half filled with distilled water and a funnel 

 inserted so that the stem extends to the bottom. A saturated 

 solution of NaCl is slowly poured into the funnel and forms a 

 layer beneath the pure water. About 1 c.c. of a mixture of 2 

 parts chloroform and 3 parts rancid olive oil is sucked up into a 

 pipette and injected into the beaker so that it forms a drop 

 suspended between the NaCl solution and the pure water. Two 

 pipettes with capillary openings are filled with 1/10 normal NaOH 

 solution and inserted into the beaker. The NaOH solution is 



