THE FROG. 23 



The muscle-corpuscles are drawn as seen after treatment with 1 p.c. acetic acid and 

 magenta ; they can, however, be readily observed in the fresh fibre. 



ii. A small portion of a similar fibre, examined fresh in normal salt-solution. 



The so-called fibrils, fb, were obtained by subsequent teasing-up after death.* F. 4. 



FIG. XVI. Unstriped muscular fibre. 



Obtained by teasing up a small piece of intestine, after maceration for some days in 

 Mailer's fluid. Borax carmine. D. 4. 



These cells hang together very tenaciously, and the left-hand portion of the figure 

 represents a small piece of the entire muscular wall of the above-named viscus, the two 

 layers of which overlie each other as in life. 



Appearances of this kind often constitute serious sources of error. 



FIG. XVII. Transverse section near the middle of the shaft of the femur. 

 Decalcified with ^ p.c. chromic acid. Alcohol and borax carmine. A. 2. 



FIG. XVIII. A small portion of the above, more highly magnified. 

 The middle lamella, Im, separates the periosteal bone from that formed by the marrow ; 

 the direction of growth of these is indicated by arrows. D. 3. 



FIG. XIX. Two adjacent bone-corpuscles, from the thinnest portion of the above 

 section, drawn under Gundlach's ^th immersion. 



FIG. XX. An entire transverse-section of the ileum ; the muscular and epitheloid layers 

 are shaded darkly. 



FIG. XXI. A small portion of the same, more highly magnified. Alcohol and borax 

 carmine. D. 3. 



No note is taken of the mucous drops borne by the epitheloid cells (the goblet-cells of 

 histologists. See Fig. II., i. and ii.) 



FIG. XXII. Section of a small portion of the liver. Alcohol and borax carmine. D. 3. 

 The bile-capillaries were distended by gently squeezing the biliary fluid back into them 

 from the gall-bladder, the bile-duct being first ligatured. 



The isolated cells, drawn under F. 3, were teased out from the fresh liver in salt 



solution. 



f The most reliable preparations of striped muscle are to be obtained by the use of the freezing-microtome. The 

 Golding Bird or Pritchard Machines can be recommended. The most recent reliable accounts of the modern aspects of 

 the vexed muscle-striation question are those of Ranvier (19), and Rutherford (84). The system of nomenclature here 

 employed in connection witli nerve, muscle, and bone, is Huxley's. 



