Professor Theodore G. Wormley, in the new edition of his work, gives the following sizes of blood corpuscles, as measured by himself and Professor Gulliver. We have only copied the sizes for mammals and birds. It will be seen that, with three or four exceptions, the sizes obtained by the two observers are practically the same: Mammals Wormley. Gulliver. Man 1-3250 1-3260 Monkey 1-3382 1-3412 Opossum 1-3145 1-3557 Guinea pig 1-3223 1-3538 Kangaroo 1-3410 1-3440 Muskrat 1-3282 1-3550 Dog 1-3561 1-3532 Rabbit 1-3653 1-3607 Rat 1-3652 1-3754 Mouse 1-3743 1-3814 Pig 1-4268 1-4230 Ox 1-4219 1-4267 Horse 1-4243 1-4600 Cat 1-4372 1-4404 Elk 1-4384 1-3938 Buffalo 1-4351 1-4586 Wolf (prairie) 1-3422 1-3600 Bear (black) 1-3656 1-3693 Hyena 1-3644 1-3735 Squirrel (red) 1-4140 1-4000 Raccoon 1-4084 1-3950 Elephant 1-2738 1-2745 Leopard 1-4390 1-4319 Hippopotamus 1-3560 1-3429 Rhinoceros 1-3649 1-3765 Tapir 1-4175 1-4000 Lion 1-4143 1-4322 Ocelot 1-3885 1-4220 Mule 1-3760 Ass 1-3620 1-4000 Ground squirrel 1-4200 Bat 1-3966 1-4173 Sheep 1-4912 1-5300 Ibex 1-6445 Goat 1-6189 1-6366 Sloth 1-2865 Platypus (duck-billed) 1-3000 Whale 1-3099 Capybara 1-3164 1-3190 Seal 1-3281 Woodchuck 1-3484 Muskdeer 1-12325 Beaver 1-3325 Porcupine 1-3369 Llama, Long diam. 1-3201 1-3361 Short " 1-6408 1-6229 Camel, Long diam. 1-3331 1-3123 Short " 1-5280 1-5876 WORMLEY GULLIVER. Birds. Length. Breadth. Length. Breadth.