First Law In every animal which has not passed the limit…
““First Law In every animal which has not passed the limit of its development, a more frequent and continuous use of any organ gradually strengthens, develops and enlarges that organ, and gives it a power proportional to the length of time it has been so used; while the permanent disuse of any organ imperceptibly weakens and deteriorates it, and progressively diminishes its functional capacity, until it finally disappears. Second Law All the acquisitions or losses wrought by nature on individuals, through the influence of the environment in which their race has long been placed, and hence through the influence of the predominant use or permanent disuse of any organ; all these are preserved by reproduction to the new individuals which arise, provided that the acquired modifications are common to both sexes, or at least to the individuals which produce the young.””
About This Quote
This interpretation was drafted with AI assistance. It is one reading of the quote, not the author's own explanation.
Repeated use of a body part strengthens it, while disuse leads to its decline; such changes can be inherited if they affect both sexes.
In simple terms: Use strengthens; disuse weakens; changes can be passed on.
Key Takeaway
Practice regularly to develop abilities.
Themes
biology
evolution
inheritance
development
Mood
scientific
educational
Type
evolutionary
biological
When to use this quote
- sports training
- musical practice
- rehabilitation
- skill acquisition
Key Concepts
use‑dependence
organ adaptation
heredity
Questions to Reflect On
- Can habits shape future generations?
- What limits the inheritance of learned skills?
A Different Perspective
Modern genetics shows most acquired traits are not inherited.