96 THE MICROSCOPIST. 



tions the globules presented a compound appearance, consisting 

 of several granules, one in the centre, with the others disposed 

 around it ; the regularity of which appearance seems to intimate 

 its connexion with the structure of the corpuscle. 



Circulation of Blood may be seen in the web of a frog's foot 

 (see page 47) ; in the fin or tail of a fish ; and in the legs, &c., 

 of many spiders and insects, especially aquatic larvae. There 

 is nothing so wonderful and pleasing as the sight of the blood- 

 corpuscle coursing through the vessels in the web of a frog's foot, 

 when seen with a power of about 200 diameters. The re- 

 searches of Kaltenbrunner, a distinguished German patholo- 

 gist, on the circulation of blood in a frog's foot, and the influence 

 of various irritants upon it, as seen under the microscope, have 

 added much to our knowledge respecting congestion and in- 

 flammation, and are of the highest interest to the practitioner 

 and student of medicine. They are referred to by Dr. Watson 

 in his preliminary lectures on the Practice of Medicine, and 

 their importance clearly shown. 



Hassal remarks, that the circulation of blood is seen to the 

 greatest advantage in the tongue of a frog. For this purpose the 

 frog should be secured by a bandage to a thin flat piece of cork, 

 &c., which is perforated at one extremity by a square aperture. To 

 this aperture the mouth of the frog should be secured, and the 

 soft, pulp-like tongue being drawn out by a pair of forceps, and 

 spread out over the aperture, may be retained in position by pins. 

 The piece of cork (answering instead of the frog-plate) should 

 . then be fastened to the stage of the microscope. 



In the view of this structure, we have displayed in action 

 various parts of the animal organization ; arteries, veins, nerves, 

 muscular tissue, epithelial cells, and glands. [Microscopic A?ia- 

 tomy.~\ 



BONE should be cut into thin sections, about ^th of an inch 

 in thickness. They can be cut with a fine saw, such as are 



