Dear Sir,

It occurs to me that there is one part of my paper which I did not make sufficiently clear.¹ When it appeared in print I feared that my views were likely to be misunderstood through the faulty conciseness of my language. A specimen of orbicular leaf has been given, (Nelumbium speciosum) but I think that I should more fully have stated that it could by no means be supposed to realize the necessary condition of the orbicular.² The round leaf of the Nelumbium I take to be merely a ‘segment’, the limb of which is modified in a peculiar way, and the plane of the limb also changed with respect to its petiole. The Orbicular leaf which is ideal, must of course be supported by its axis, and therefore be a plant of itself. The round leaf given is merely to make more easy to be understood the views I put forth. The disjecta membra of the orbicular type I had intended to investigate throughout the simpler forms of vegetable life.³ I was anxious to show, at once, that there is mutation in forms, and proved by actual facts that changes from comparatively simple to very complex forms do take place. Figures from 9 to 21 give examples which are evident proofs to any person, even though he be not a Botanist.⁴ It was to these facts that I wished to draw your attention, and receive your opinion upon them. I thought they would naturally interest you, having read with so much pleasure your views on the ‘Origin of Species’ &c.

With respect to the angle of divergence to which you are so kind as to draw my attention, it does not encourage me to undertake the investigation to say that you have failed. I confess that as yet I have been able to pay little attention to the subject.⁵ But, perhaps, you have remarked that I have perceived the angle to change for the leaflet coming off. (page 7, line 25, observations on change of direction in enlarging vein, in fig. 10, marked g.) It would be interesting to note the former angle, and the latter, comparing the difference with the progress of the leaflet in separating itself. This might give some clue. But, I do not wish to intrude crude speculations upon your attention.

At present, I am not in a position to pursue the subject, but I hope soon to be so; and, assuredly, the pleasure of acting upon your suggestion would equal to the pleasure of investigating an interesting point.

I have the honour to be, Dear Sir | Very truly Yours | Geo. Sigerson MD.