33ê 



Readings at: 70° 40^ 50"^ faftrv 12 lu-s) 19° 19° (nfu-, 12 ins- 

 Consistence: fl. Ü. fl- solid solid 



Intensity: 1,4 2,8 4 8 



To sum np the above, we have first of all to call attention to 

 the fact, that we have observed a change in the intensity of the 

 TYNDALL-])henomenon in a gelatin-solution at a constant temperature. 

 It occurs in the sol- as well as in the gel-condition and seems to 

 proceed according to a fixed rule. This changing process sometimes 

 lasts several days, the solution approximating an equilibrium, 

 determined by the temperature. 



The influence of the temperature on solutions of varions concen- 

 tration is not the same. In a IVo solution it is not, or hardly, 

 noticeable beyond 40°; very great, however, below 30°; in a 57„ 

 solution the intensity increases rapidly even at 40°. 



This does not seem to be attributable to the change from sol to 

 gel. Still, there is most likely some connection, since the change of 

 the TYNDA]-L-('one always becomes more distinct below a temperature 

 about 10° higher than that at which the gelatification can be con- 

 sidered to have been established. 



Physiology. — "Eiperiments on the atonical muscle." By Prof. 



J. W. Langelaan. (Communicated by Prof. H. Zwaaruemaker). 



(This communication will not be published in these Proceedings). 



Chemistry. — *'(>« the formation of nn aldehyde from s. divinylgly- 



col." By P. Muller. (Communicated by Prof. P. van Romburgh). 



(This communication wil" not be published in these Proceedings). 



E R R A T U M. 

 Proceedings of March 22 and April 25, 1913. 



p. 12.56 1. 4 from the bottom for: of which 



read : for each of whose partial sequences 

 p. 1256 1. 1 from the bottom, 1 for: of the sequence 

 and p. 1257 1. 1 from the top / read: of each partial sequence of 



) the sequence 



p. 1257 1. 11 from the top foi- : bi<^u<^Ci 



i i i 



read : bi <^ a <^ ci [hi <[ Cf). 



(October 24, 1913). 



