1. Introduction -- 2. The scaling of average daily metabolic rate and energy intake -- 3. Why do larger species invest relatively less in their offspring? -- 4. The intraspecific relationship of parental investment to female body weight -- 5. Growth and probability -- 6. Quantitative models of body size -- 7. Sexual dimorphism in body size -- 8. Are larger species more dimorphic in size? -- 9. Surface area/volume arguments in biology -- 10. Prospectus