388 
B. MELLAND. 
has kindly examined my drawings and specimens, and sug- 
gested alterations in the paper, and to Mr. J. Priestly, M.B. 
Brief Summary of Results. 
The chief results at which I have arrived may be sum- 
marised as follows : 
There is an intracellular network present in the striped 
muscle-fibre of Dytiscus, the Bee, Frog, Lobster, Crayfish, 
and Rat, which may be most clearly demonstrated by certain 
methods of gold staining. The network alone is stained by 
the reduced gold, and, owing to this differentiation, is plainly 
visible even with comparatively low powers. This network 
may be demonstrated, though not so completely, in the living 
fibre, and in acetic and osmic acid preparations. 
Crossing the fibre transversely, united to the sarcolemma, 
and more or less separating the muscle-fibre into compartments, 
are network partitions — the transverse networks. 
Running longitudinally down each compartment, and join- 
ing the dots at the intersections of the fibres of the transverse 
network, are a series of fine rods. The arrangement of this 
network will be made evident by reference to diagrams 1, 2, 
3, and 4. 
This network consists of an isotropous material, and is more 
highly retractile than the rest of the muscle substance, which 
is anisotropous. This network serves to explain the transverse 
striation and other complicated appearances presented by the 
muscle-fibre, and brings into harmony many of the conflicting 
statements of histologists on this subject. 
