Козву: RECENT BOTANICAL COLLECTING IN COLOMBIA 47 
such sudden and wide changes for their life and health. It oc- 
curred to me while experiencing these conditions that some in- 
structive experimental work might be done by removing those 
plants to conservatories and subjecting them to various conditions 
of temperature, among others the changeable ones under which 
they have been accustomed to grow, and to compare the results 
upon their life history. 
