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Vol. 2. p. 712. Mr G. Luxford remarks in discussion on Rhizogens.

"But after all, the division or non-division of the embryo, though in the more highly developed plants of very gr^t value, as indicative of accompanying peculiarites of structure, in many of the humbler members of the V. Kingdom seems really of minor importance, since in some avowedly exogenous genera, as the Monotropaceae, the embryo is undivided, while some as undoubtedly endogenous plants possess a divided embryo; & R. Brown says "an embryo of exactly the same kind, as that of Rafflesiaceae & Balanophoreae exists in Orobanche, & other, perhaps all other genera parasitic on roots." Indeed when true leaves are altogether absent, or are so deficient in development as they are in such plants as Rafflesiaceae, Orobanchaceae, Monotropaceae, we need not be surprised at the absence or slight development of cotyledons in the embryo. In the exogenous Cuscutaceae, too, the species of which are

82 verso

wholly destitute of leaves, the embryo is spiral, filiform & perfectly acotyledonous." —

(See to Lindley Veg. K. for all this: excellent example of indirect working back effect. —

83

Vol. 2. p. 765. H. C. Watson "Note on some British species" &c.

Assuming the Sisyrinchium auceps to be clearly wild in Galway, "the explanation how it got thither will be equally difficult with that which is to be given for the occurrence of Neottia gemmipara, or Eriocaulon septangulare." —

p. 849. Review of Babingtons Manual.

Cerastium nigrescens admitted rightly by B. himself & be a var. of C. latifolium, yet C. nigrescens comes up absolutely true from seed. —

p. 850 remarks that "the test of hereditary descent is valuable chiefly for showing forms which are not genuine species."