24 Memorias de la Sociedad Científica 



striact'.ires and movements already described in a former 

 paper.'^' 



4.*'' Myelin is doubtless a mixture o£ oléats and impuri- 

 ties. Oleat affords a great number o£ wonderful imitations 

 o£ structures, movements and evolutions o£ protoplasm. Oleic 

 acid should be combined Avitli álcali and the mixture observad 

 in a drop o£ water, urth tíie microscope, without couvre-ohjecL 

 Tlie main structures are as £ollows: 



1. Emission o£ tubes, by endosmotical absorptioQ o£ 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 o£ common al- 

 caline soap and water, there are vibrating movements o£ di- 

 vergent cilia and in£usorial evolutions. (Fig. 53 and 55.) 



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

 ding in spherical appendices, endowed with rapid movements.. 

 (Fig. 55.) 



A mass o£ this kind has been £ound to circuíate as in£u- 

 sorian during eight minutes. (Fig. 53.) This is aproo£o£my 

 theory o£ vibratory motion explainedby osmotical currents.'^'' 

 Sometimes a httle 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 o£ blood-vessels o£ 

 the frog, with nucleus, by the extensión o£ myelin grains. 

 (Fig. 64.) 



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

 in a solution o£ glycerine (5) in water (7), there appears many 

 drops that púlsate and rotate. 



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

 a small quantity o£ water, £or 24 hours. There is an exten- 

 sión of the concentrical grains o£ myelinjand on adding a £resh. 



(1) "Memorias de la Sociedad Álzate." Tol. XEf, p. 241, pl. IV. 



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



