216 THE ANIMAL KINGDOM. 



HAIRS OF BATS. 



These are very remarkable, that of the Indian Bat pre- 

 senting whorls of scales at regular intervals along the shaft ; 

 others give variety in the medullary structure. 



HAIR OF ELEPHANT. 



This is a transverse section, showing groups of empty 

 cells here and there, and others in dense clusters containing 

 pigment. Examine with polarized light. 



HAIR OF CAMEL. 



More nearly resembling wool, soft and flexible, with 

 distinct cortical cells, giving it the appearance of being 

 jointed. 



HAIR OF REINDEER. 



In the Deer there are few cortical cells, but the medul- 

 lary cells are so developed, that they resemble the cellular 

 tissue of vegetables. 



HAIR OF ORNITHORHYNCHUS. 



A whole hair of this curious little animal presents a com- 

 bination of wool and of hair. The base, which is long and 

 slender, being quite woolly, and the upper part enlarged 

 considerably, and showing imbricated scales on the surface. 

 The Ornithorhynchus is a most singular little animal, about 

 one foot and a half long, with a head somewhat like a 

 duck ; a body like a mole, and yet so unlike any other 

 animal that it was at first disbelieved such a genus existed. 

 It is a native of New South Wales, and called by the 

 colonists the Water-mole. 



HAIR OF LARVA OF DERMESTES. 



This is used as a test object, and, when viewed with a 

 good clear i-inch object glass, should show the shaft thickly 

 covered with minute spines or scales, placed on whorls up 

 to the tip, where the last whorl is composed of broader 

 hairs or scales, somewhat resembling the petals of a flower, 

 and each scale terminated by a little knob. 



