ANIMAL RESOURCES AND FISHERIES OF UNITED STATES. 231 



Derived from ii»hc§. 



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



rennet.) 

 Skins of eels, used by negroes for rheumatism. 



Derived froiii insects. 



Vesicatory preparations from American beetles, Cantharis cinerea 



and C. vittata. 

 Vesicatory preparations derived from foreign beetles, cantliarides 



or Si)anisli Hies {Cantharis vesicatoria), and other species, and 



substitutes, Mylahris cichorii, Cercoma Schocfferi, Meloe, sp., 



var., «&;c. 

 Vesicatory preparations from American spiders, such as Tegenaria 



medicinalis. 

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



Derived from Crustacea. 



Salve-bug of fishermen of Banks (Ca%MS cjtrtws), parasite on cod- 

 fish. 



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

 antacid. 



Derived from ivorms. 



American leech {MacroMella <?ecorcr),used in surgery. 

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

 (African leech [Hirudo trochina), introduced.) 

 Leeches used as barometers. 



Derived From moliusks. 



(Cuttle-fish bone of Sepia officinalis.) (See under D, III" n.) 

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

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



Derived iTrom radiates. 



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



Derived Iroan protozoans. 



Burnt sponge, formerly used in medicine. 



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



31. Fertllizees. 

 IVatitral g^uanos. 



Bat guano from caves. 



Bird gaiano from oceanic islands. 



