146 II. ANIMALS.—Insecta. 



duces pearls, Scotch pearls, mostly irregular in shape, useless for 

 ornaments ; ground and washed over, margaritcB preparatcB. 



*CocKLE, Cardium edule. Flesh eaten raw, or dressed, also 

 pickled for sauce. 



*MyA PICTORUM. Shells, colour shells, used to spread colours 

 upon. 



8. VERMES. 



*Leech, Grei/ leechy Hirudo, H. officinalis, H. sanguisuga. 

 Back brown, with six yellow lines and intermediate black lines ; 

 foot grey, with black spots ; mouth three-cornered, anus round : 

 bite used as a mode of bleeding', each leech sucks not quite 3j of 

 blood, but much runs afterwards from the wounds : castor oil is a 

 good application to leech bites when they are painful, or go into 

 sores. 



Green leech, Foreign leech, Hirudo provincialis. Foot green, 

 uniformly coloured ; used for bleeding. 



*Bastaiid leech, Hirudo camivora. Foot becomes yellow in 

 spirit of wine. 



*Black leech, Horse leech, Hirudo hcemopis sanguisuga. Teeth 

 round, cannot penetrate the human skin. 



9. CRUSTACEA. 



*Craw fish. Cancer astacus, Astacus fiumatilis. Concretions 

 in the stomach when about to change their shell, crahs eyes, oculi 

 cancrorum, concrementa cancrorum, C P. absorbent. 



*Laiige sea crab, Cancer pagurus. Black tips of the claws, 

 crabi claws, chelce. cancrorum, absorbent. 



Hog lice. Wood lice. Millepedes, Aselli, Oniscus asellus. Alive 

 no. 12, or dried and powdered, 3j to 3j, diuretic, used in jaun- 

 dice ; a large variety imported from Russia. 



10. INSECTA. 



Used internally are mostly diuretic, and in excess produce 

 strangury, or bloody urine ; externally vesicatory. 



Spanish flies, Blistering flies, Cantharides, Meloe vesicatorius, 

 LyttcB, Cantharis. Used to raise bhsters, and internally as stimu- 

 lant and diuretic, gr. j to iv ; imported from South America. 



Riband Cantharides, Telini flies, Meloe cichorii, Milabris 

 cichorii. Used by the ancients, and now in China and Upper 

 India. 



PoTATOE FLIES, Cantharides vittatce, P. U. S., Lytta vittata. 

 Used in the United States. 



