The Principles of Biology, Nide 1

actions activity aggregate Algæ alleged Amphibia animals arise assume atoms become body carbonic acid cause cells changes characters chemical chromatin classes co-ordination colloids complex compounds constituting continuous contrasts creatures Darwin decrease definite degree differentiation distinct divergence effects elements embryo energy environment equilibration ethereal waves evidence evolution exist external facts fertilized functions further gamogenesis gemmules genesis germ germ-cells greater groups growth habitats habits Hence heterogeneous higher Hydrozoa hypothesis implies incident forces increase individuals inheritance kind larvæ less limbs living mammals mass ment Metazoa modes modifications molecular mobility molecules motion multiplication muscles natural selection nervous nitrogenous nutriment nutrition organic matter original ovum parent Parthenogenesis phenomena physiological units plants principle produced Professor Weismann Protophyta protoplasm Protozoa relations reproductive result separate shown somatic cells special creations species sperm-cells spermatozoon structure substance supposed tion tissue traits truth types unlike variations Vertebrata vital