240 B. MELLAND. 



DESCRIPTION OF PLATE X. 



Diags. 1, 2, 3, and 4. — Diagrammatic views of the network in striated 

 muscle. 

 Diag. 1. — Perspective view of the fibre, showing the transverse 

 network, a, at each membrane of Krause, and the longitu- 

 dinal lines. 

 Diag. 2. — Perspective view of a portion of the network, 

 showing: — a. The transverse networks, with polygonal 

 meshes and dots at the nodes, b. The longitudinal bars 

 of the network ending in the dots. 

 Diag. 3. — The fibre seen in longitudinal view. The transverse 

 network, a, appears as a row of dots crossing the fibre (in 

 the position of Krause's membrane), c. Minute thicken- 

 ings on the longitudinal bars of the network, midway 

 between the transverse networks. 

 Diag. 4. — The fibre seen in transverse section. 



Diag. 5. — Network as seen in a longitudinal view of the fibre, showing 

 the production of alternating bright and dim bands by 

 refraction around the nodal dots. 



Diag. 6. — So-called transposition of the bands, as seen in an osmic 

 acid preparation of muscle of Bee. u. Appearance at 

 upper focus, l. Appearance at lower focus. 



Diag. 7. — Oil globules in water, showing their refractive effect upon 

 light, u. At the upper focus, each globule surrounded 

 by a dark border, l. At the lower focus, each globule 

 surrounded by a bright halo. 



Diag. 8. — Production of sarcous elements by contraction of the matrix 

 and splitting along the guide lines formed by the bars of 

 the network (seen in spirit preparations). 



Diag. 9. — Formation of Cohnheim's areas by contraction of the matrix 

 as above. In this transverse view of the fibre the pris- 

 matic sarcous elements are seen on end, and appear as 

 polygonal areas separated by bright lines. 



Fig. 1. — Fibre of Dytiscus, prepared by the gold method. Zeiss, 

 D obj., No. 5 oc. 



