On Broivnian Movements. Bij Wm. M. Orel. 



659 



alkali-albumen manifest three well-marked degrees of combining 

 affinity for the oil, with which as many well-marked degrees of 

 emulgence and molecular vibration correspond. The movements 

 are produced or hindered by the same class of relations which 



Fig, 



Fig. 2. 



a, Simple vesicle, containing clear, not oily contents. 



h. Cell with laminated walls containing oil-globule floating in aqueous fluid. 



c, (/, c. Vesicles containing emulsions of various fineness. 



/, Vesicle containing a smaller vesicle with emulsion. 



cause a piece of paper soaked in alcohol to move with violent 

 jerks and in all directions when thrown upon a surface of water, 

 or allow a piece of paper soaked 

 in paraffin to float quietly with a 

 simple linear movement to the 

 margin determined by the attrac- 

 tion of the containing vessel. 



As regards the second, the che- 

 mical stability or indisposition to 

 decomposition, of the suspending 

 fluid shows well-marked grades in 

 the several experiments. 



a. We find that egg-albumen is 

 unfavourable to active movement in 

 proportion to its viscosity. What 

 may be the exact meaning of vis- 

 cosity cannot be discussed here, 

 but albumen in the viscous state 

 is not prone to rapid decomposition, 

 tending, indeed, when exposed in open vessels not too deep, to 

 dry up without putrefying. This influence of viscosity is well 

 illustrated in condensed milk. 



h. Albumen being mixed with water putrefies with a readiness 

 proportioned to its dilution ; and it is seen to favour movements in 

 proportion. 



c. xllkaline solutions of albumen putrefy more readily than 

 simple solutions. With alkali the movements are quickened. 



d. On the other hand, acid-albumens do not putrefy readily. 

 Solutions of syntonin in acid can be kept for a long time, and the 

 durability of peptones is notorious. With acids the movements 

 are hindered in some proportion to the strength or excess of acid. 



e. But peptones being neutrahzed by alkali fall at once into 

 putrefactive changes. 



a, Laminated cell, thin on one side 

 as most are, containing oil-globule 

 floating iu aqueous fluid. 



&, An irregular mass of fut, in- 

 vested by a membrane, the folds of 

 which are very plainly marked, and 

 containing a vesicle. 



