Notes . 165 
the formation of double flowers. I am familiar with certain changes 
which appear to be the result of the action of mites (Phytopti), such 
as a preternatural development of scales, but I have not been led at 
present to co-relate the injuries inflicted by mites with the development 
either of Peloria or of double flowers. 
MAXWELL T. MASTERS, London. 
OH DR. MACFARLAHE’S OBSERVATIONS OH PITCH- 
ERED IHSECTIVOROUS PLAHTS.— While recognising with 
much satisfaction that Dr. Macfarlane’s examination of the pitcher 
of Nepenthes has led him to conclusions which are in part similar to 
my own 1 , I think it is nevertheless necessary, to point out that our 
views are by no means coincident, and the difference depends upon 
a certain fundamental factor in morphological method. 
The chief point on which we agree is that the lid of the pitcher of 
Nepenthes is the result of congenital coalescence of two pinnae ; but I 
regard these as the only pinnae formed by the winged phyllopodium, 
while Dr. Macfarlane says, £ We may fairly view a Nepenthes leaf as 
being compound, and composed of from three to four or five pairs of 
leaflets disposed along a midrib, and that both leaflets and midrib 
undergo striking modifications, the leaflets especially showing a marked 
tendency to dorsal fusion above/ Dr. Macfarlane further constructs 
a diagram (Fig. 7), and explains (p. 259) that he regards the lid as 
the result of coalescence of the third pair of pinnae, the two lower 
pairs being represented by the regions marked (< 5 ) and (c) in his 
diagram. In my view, however, the lateral flaps which he regards as 
pinnae are merely developments of those wings, which are to be seen 
here, as in so many leaves from the Ferns upwards, traversing the 
whole length of the phyllopodium longitudinally, and I base this view 
upon the fact that these wings are visible as smooth flanges in very 
early stages of development, there being (with the exception of the 
young lid) no rounded and projecting outgrowths upon them which 
could be recognised as pinnae. The study of the external form and 
internal structure of the mature leaf cannot suffice to substantiate such 
a view as that of Dr. Macfarlane. In order to support his view it 
will be incumbent upon him to show that distinct rounded outgrowths 
do appear on the wings of the young leaf ; but he does not give any 
such evidence, nor do my own observations or those of Sir J. Hooker 
Annals of Botany, vol. iii, p. 239, and p. 253. 
