94 THE MICEOSCOPIST. 



overthrow the assertion of Scripture, " God hatli made of one 

 blood all nations of men." 



Care should be taken to select both the hair and the wool 

 from each animal, as they differ materially in their structure ; 

 the finer kind, or what is known as wool, being endued with 

 the property termed felting, which property is of considerable 

 importance in a manufacturing point of view. The felting 

 property is owing to the imbricated scales on the outside of each 

 hair. In the adult human hair this structure is not very 

 apparent, but may frequently be seen in fine specimens from 

 very young infants. These, however, should not be mounted 

 in balsam. 



The smaller kind of hair may be mounted dry or in fluid; 

 or, if of a dark color, in balsam. Horizontal and vertical 

 sections should be made of large hairs and spines, which may 

 be done after gluing a number together, in the same way that 

 sections of wood, &c., are made. 



Sections of horns, hoofs, quills, whalebone, spines of echini, 

 &c. ; are all interesting objects. 



ANATOMICAL OBJECTS AND PREPARATIONS. 



BLOOD. To examine this vital fluid, it is necessary to place 

 upon a glass slide a small drop recently taken, and cover it 

 with a thin glass or piece of mica. The blood-corpuscles may 

 also be preserved in Dr. Goadby's A 2 fluid, or prepared by 

 drying rapidly on the slide and covering with the thinnest 

 glass. 



The red corpuscles in man are of a circular flattened form. 

 If water be added to them, they become spherical by endos- 

 mose. Their appearance varies as they are viewed a little in 

 or out of the focus of the microscope ; in one place showing a 



