r S43 1862] HOMOLOGIES 277 



done. Some of the ducts of the upper sepal l and upper petal Letter 605 

 run to the wrong bundles on the column. I have seen no 

 such case. 



; .. %i* 



"^ 



/ 







- 



Fig. 9. HABENARIA CHLORANTHA (Longitudinal course of bundles). 



The three upper curved outlines, two of which passing through the words " upper 

 sepal," " upper petal," " lower sepal," were in red in the original ; for explanation 

 see text. 



This case apparently shows that not the least reliance can 

 be placed on the course of ducts. I am sure of my facts. 



There is great adhesion and extreme displacement of parts 

 where the organs spring from the top of the ovarium. Asa 

 Gray says ducts are very early developed, and it seems to me 



1 These would be described by modern morphologists as lower, 

 not upper, sepals, etc. Darwin was aware that he used these terms 

 incorrectly. 



