CONTENTS. 



NUMBER TWENTY. 



1. Temperature of the Soil, 289 



2. Bottom Heat 334 



3. Potato Disease, 338 



4. Addenda to our Table of Temperature, 341 



5. New Mode of Inarching, 342 



6. Apus Affinis, 342 



7. A Fertilizer? 343 



8. Friends and Patrons, 344 



