24 



Memorias de la Sociedad Cientifica 





structures and movements already described in a former 

 paper. ' 



4. th Myelin is doubtless a mixture of oleats and impuri- 

 ties. Oleat affords a great number of wonderful imitations 

 of structures, movements and evolutions of protoplasm. Oleic 

 acid should be combined with alcali and the mixture observed 

 in a drop of water, urth the microscope, without couvre-object. 

 The main structures are as follows: 



1 . Emission of tubes, by endosmotical absorption of water, 

 either straight or in spirals, pointed or with an appendix sim- 

 ple or compound, spherical or egg-shaped. (Fig. 1-9, 39-43.) 



2. Spherical cells with depressed nucleus. 



3. Mixing the oleic acid with certain kind of common al- 

 caline soap and water, there are vibrating movements of di- 

 vergent cilia and infusorial evolutions. (Fig. 53 and 55.) 



By adding oil there appears a cordon with lateral cilia en- 

 ding in spherical appendices, endowed with rapid movements. 

 (Fig. 55.) 



A mass of this kind has been found to circulate as infu- 

 sorian during eight minutes. (Fig. 53.) This is a proof of my 

 theory of vibratory motion explained by osmotical currents. 12 ' 

 Sometimes a little mass is in motion and as it goes along it 

 undergoes many alterations in its general shape. (Fig. 56- 63.) 



4. By heating there appears a number of blood-vessels of " 

 the frog, with nucleus, by the extension of myelin grains. 

 (Fig. 64.) 



5. By triturating the myelin in the glass; with the finger, 

 in a solution of glycerine (5) in water (7), there appears many- 

 drops that pulsate and rotate. 



6. The mixture of soap and oleic acid is macerated but in 

 a small quantity of water, for 24 hours. There is an exten- 

 sion of the concentrical grains of myelinjand on adding a fresh. 



(1) "Memorias de la Sociedad Alzate." vol. ,X l,f , p. 24], pi. IV. 



(2) 1. e. vol, X, 1896-97, p. 322. 



