PERIPLANETA. 



124. Viscera. Fix the cockroach, ventral surface downwards, by pins through the 

 sides and carefully remove the terga. Make a drawing to show the dorsal heart, and alar}' 

 muscles. Then unravel the alimentary canal and draw : oesophagus ; crop ; gizzard ; 

 caeca ; midgut ; Malpighian tubules ; small intestine ; colon ; rectxim ; salivary glands 

 and receptacle ; cerebral ganglion ; fat-body. 





125. Salivary Glands. Remove one of the salivary glands with its receptacle and 

 ducts. Draw it under the low power. 



