@book{bhlitem16389, title = {The principles of biology }, volume = {1}, copyright = {Public domain. The BHL considers that this work is no longer under copyright protection.}, url = {https://www.biodiversitylibrary.org/item/16389}, note = {https://www.biodiversitylibrary.org/bibliography/1472}, publisher = {New York, D. Appleton and company, 1898-1900}, author = {Spencer, Herbert,}, year = {1898-1900}, pages = {528}, keywords = {Biology|}, }