ANIMAL RESOURCES AND FISHERIES OI-' TTNITED STATES. 231 



Derived from Itches. 



(Intestines of j>rayling, used by Laplanders as a substitute for 



rennet.) 

 Skins of eels, used by negroes for rheumatism. 



Derived from iii!!»ect«. 



Vesicatory preparations from American beetles, Cantharis cinerea 



and C. vitiata. 

 Vesicatory preparations derived from foreign beetles, cantliarides 



or Spanish liies {Cantharis vesicatoria), and other species, and 



substitutes, Mylabris cichorii, Cercoma ^chceffcri, MeJoe, sp., 



A^ar., &c. 

 Vesicatory preparations from American spiders, such as Tegenaria 



medicinal is. 

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



Derived from eriistacea. 



Salve-bug of fishermen of Banks ((7rt7i^?<s c»rfMs), parasite on cod- 

 fish. 



Crabs' eyes, or concretions fi-om stomach of astacus, used as an 

 antacid. 



Derived from ^voriMs. 



American leech {Macrohdella f/ecor«),used in surgery. 

 (European leech {Hirudo medicinalis), introduced into America.) 

 (African leech {Hirudo trochina), introduced.) 

 Leeches used as barometers. 



Derived from iMoIlii!!ik§. 



(Cuttle-fish bone of Sepia officinalis.) (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 fro^ii protozoan!^. 



Burnt sponge, formerly used in medicine. 



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



31. Fertilizers. 

 I¥atiiral guanos. 



Bat guano from caves. 



Bud guano from oceanic islands. 



