ANIMAL RESOURCES AND FISHERIES Of UNITED STATES. 231 



Derived from fishes. 



(Intestines of grayling, used by Laplanders as a substitute for 



rennet.) 

 Skins of eels, used by negroes for rheumatism. 



Derived from inseets. 



Vesicatory preparations from American beetles, Cantliaris clnerea 



and C. vitlata. 

 Vesicatory preparations derived from foreign beetles, cantharides 



or Spanish flies (Cantharis resicatoria), and other species, and 



substitutes, Mylabris cich-oni, Cercoma Sck&fferi, Meloe, sp., 



var., &c. 

 Vesicatory preparations from American spiders, such as Tegenaria 



medic inalis. 

 Gall-nuts, used in medicine (see under 29). 



Derived from Crustacea. 



Salve-bug of fishermen of Banks (Caligus curtus), parasite on cod- 

 fish. 

 Crabs' eyes, or concretions from stomach of astacus, used as an 



antacid. 



Derived from worm*. 



American leech (Macrobdella decora), used in surgery. 

 (European leech (Hintdo medicinaUs), introduced into America.) 

 (African leech (Hintdo trochina), introduced.) 

 Leeches used as barometers. 



Derived from niollusks. 



(Cuttle-fish bone of Sepia offitinalls.) (See under D, III, H.) 

 Calcined shells, used for building-lime and in manufacture of denti- 

 frices and enamel. (See under D, III, H.) 



Derived from radiates. 



a, Limes, derived from calcining coral and coral rock. 

 Derived from protozoans. 



Burnt sponge, formerly used in medicine. 



Infusorial earth and its applications. (See above under K.) 



.31. FERTILIZERS. 

 Natural guanos. 



Bat guano from caves. 



Bird guano from oceanic islands. 



