COMPARATIVE WEIGHTS OP THE KIDNEYS. 



Comparative Weights of the Kidneys of Animals. 



125 



FISHES. 



Weiglit of the body of Trijgon sahina (Stingray), female 



" " Tryyon sahina (Stingray) foetus 



" " Zygcena maUeus (Hammerhead Shark) 



" " Zygcena malleus (Hammerhead Shark) 



REPTILES. 



" Rana cateshiana (Bullfrog) 



" Heterodoii niger (Blaek Viper) . 



" PsammopJiis flagelliformis (Coachwhip Snake) 



" Coluber guttatus (Corn Snake) 



" Coluber constrictor (Black Snake) 



" Crotalus adamanteus (Rattlesnake) 



" Alligator 3Iississvppiensis (Alligator), male 



" Alligator Mississippiensis (Alligator), female 



" Chelonia caretta (Loggerhead Turtle) . 



" Chelonura serpentina (Snapping Turtle) 



" Emys terrapin (Salt-water Terrapin) . 



" Emys reticulata (Chicken Terrapin) 



" Emys serrata (Yellow-bellied Terrapin) 



" Emys serrata (Yellow-bellied Terrapin) 



" Emys serrata (Yellow-bellied Terrapin) 



" Testudo polyphemus ((3iO])\v&v) . 



" Testudo polyphemus (Gopher) . 



BIRDS. 



" Ectopistes Carolinensis (Turtle Dove), female 



" Ectopistes Carolinensis (Turtle Dove), male 



" Ortyx Virginiana (Quail) 



" Meleagris gallopavo (Wild Turkey) 



" Meleagris gallopavo (Wild Turkey) 



" Picus erytlirocephalus (Redheaded Woodpecker) 



" Ardea nycticorax (Night Heron) 



" Tantalus loculator (Wood Ibis) 



" Tantalus locidator (Wood Ibis) 



" • Buteo borccdis (Hen Hawk) 



" Syrniiini nebidosum (Barred Owl) 



" Cathartes atratus (Black Turkey-Buzzard) 



" Ardea cundidissima (Snowy Heron) , 



MAMMALS. 



" DidelpMs Virginianus (Opossum) 



" Common Sheep 



" Sciurus Carolinensis (Gray Squirrel) . 



" Sciurus capistratus (Fox Squirrel) 



" Lepus sylvaticus (Common Rabbit) 



" Mus rattus (Young Rat), just born 



• " 3Ius rattus (Young Rat), just born 



" 3Ius rattus (Rat), half grown . 



" Procyon lotor (Raccoon), female 



" Procyon lotor (Raccoon), female 



" Procyon lotor (Raccoon), female 



" Procyon lotor (Raccoon), just born 



" Pointer Dog .... 



" Common Cat .... 



Number of times the 

 weight of its kidneys. 



188 

 93 

 346 

 335 



515 



m 



88 

 152 



t6 

 131 

 135 

 145 

 368 

 249 



280 

 409 

 416 

 495 

 322 

 360 



182 

 23t 

 125 

 204 

 206 

 81 

 9t 

 168 



m 



141 



ite 



132 



86 



131 

 350 

 175 

 14t 

 186 

 90 

 105 

 92 

 66 

 57 

 61 

 68 

 178 

 142 



The following conclusions may be derived from this table : — 

 1. The kidneys of Ophidians and Saurians are much larger relatively than those 

 of the Chelonians. This difference will be readily understood by a comparison of 

 the habits and vital and physical constitution of these two classes. 



