476 me. Gr. V. ELLIS ON THE NATUEE OE THE 
voluntary fibre. By their arrangement they occasion the granular appearance of the 
surface under a low magnifying power*. 
In the involuntary muscular tissue now described, as well as in the voluntary fibre, 
the ultimate fibrils will be composed, then, of similar minute particles or sarcous 
elements;” but these are so arranged as to produce transverse striae in the fibre of 
voluntary muscle, and a dotted condition in the fibre of the involuntary^ muscle of the 
bladder. 
Explanation of the Plates. 
PLATE XXVI. 
Fig. 1. This drawing shows the back of the human bladder vrith the prostate and 
seminal appendages, together with the urinary canals. The bladder was very- 
fleshy and much contracted, and is here depicted of the natural size. The 
greater part of the drawing is in outline ; but a portion on one side (about 
the middle) is finished to display the intercommunications of the fleshy 
bundles, and the tendinous intersections on those bundles for the insertion of 
the muscular fibres. 
Eig. 2. Pepresents, once enlarged, a fasciculus of fibres from the sartoiius muscle of the 
thigh. Two of the secondary bundles have been imi’avelled to show the in- 
terweaving between smaller contiguous sets of fibres, as in the involmitary 
muscle ; and with greater care a more minute separation might be made. It 
serves to demonstrate that the muscle is a web-like mass, instead of a collec- 
tion of long parallel fibres which are fixed only at the extremities of the 
muscle. 
Fig. 3. The figure marked by a is copied from a bundle of muscular fibres of the 
bladder which had been immersed in dilute nitric acid, after the manner 
recommended to bring into view the cell-structure of the tissire. Bulgings 
alternate with narrowed aird twisted parts orr the fibres, a coirdition hich is 
not uncommon. Granular masses, some being eriderrtly the reirrains of 
corpuscles, are seen here and there. 
The letter I poiirts to the second figure, exemplifying how fragments of 
such fibres would resemble the cells of Professor Kollikek, by being wide 
at the middle, pointed at the ends, and possessing a corpuscle or rrucleus. 
These two fragments, and others like them, were in another paid of the field 
of the microscope. 
* Mr. Bowmax seems to have thought it probable that similarity of structure might exist iu the 
two kinds of muscle. He says, “ Occasionally these granules are arranged in a linear series for some 
distance. This condition is probably an approximation towards the structure of the striped fibre, for I have 
observed the granules to be about the size of the sarcous elements of the voluntary muscles above described.” 
Cyclop, of An a t. and Physiol., article “ Muscle and Muscular Action.” 
