450 Macfar lane.— Observations on Pitchered 
manner, but the change observable in their size as compared 
with those of the parents proves that they equally are 
altered. 
Every species of Sarracenia has now been crossed, and 
many of the hybrids have been successfully recrossed. The 
same is true of cultivated species of Nepenthes , and it remains 
to be seen how far these will show fertility and keep true to 
the inherited features. 
IX. Supplementary Note on the Morppiology of 
the Leaves and Pitchers. 
In No. 13, Vol. iv of the Annals of Botany, Professor 
Bower has subjected to detailed criticism and comparison 
his own and my views regarding the morphology of pitchered 
insectivorous Plants, and since the latter part of my paper 
was in MSS. Professor Goebel 1 has expanded his previously 
expressed opinions 2 on the subject. A few words in reply 
may not be out of place. 
Both writers, I believe, err in tracing the earlier develop- 
mental stages, without attempting to connect these step by 
step with all the peculiarities shown in the mature condition. 
Thus Professor Bower objects to the view that there is more 
than one pair of leaflets in Nepenthes , and this at once leads 
up to the fundamental difference in our treatment of the 
subject. He regards as leaflets only such rounded outgrowths 
of the mid-rib as develop early from it in an isolated manner, 
and by comparatively narrow attachment. Such a limitation 
would involve the assumption that leaflets are formations 
distinct from, and at no period in their history derived from, 
the lamina or the ‘ wings of the phyllopodium.’ But develop- 
mental evidence and the structure of mature leaves alike 
prove that they are lobes of the ‘ wings 5 which by localized 
and intercalary growth have been separated from the latter. 
The transitional stages in the process furnished by Umbelli- 
1 Pflanzenbiologische Schildertmgen, Part II, 1891. 
2 Vergl. Entwickelungsgeschichte der Pflanzenorgane, Schenck’s Handbuch der 
Botanik, Bd. iii. 
