Gives CD references to papers on eyes of lower animals.

Has read MS of AM’s review [of Origin, read at Edinburgh Royal Society, 20 Feb 1860]; has no complaints. Has never heard of a hostile reviewer’s doing so kind and generous an action [as sending his MS for CD’s criticism?]. Sends some remarks on details.

In his former note CD omitted to criticise AM’s explanation that the function of hybridisation is to prevent extinction should the males of a rare species die out.

Disputes that "Oken, Lamarck & Co throw some light on Classification, Embryology & Rudimentary organs". In the case of embryology there must be introduced the principle of variations not supervening at a very early age and being inherited at corresponding ages. In classification descent alone will not do; it must be combined with the principle of divergence of character and descent from dominant and increasing forms.

Has examined Leschenaultia and concludes the external viscid surfaces have nothing to do with the stigmatic surface. Agrees with CD’s style and nectary conclusions; accounts for their form and position in irregular flowers by describing floral development.

[Enclosed are some queries by CD with answers by JDH. Gives information on seed setting by Mucuna

and an opinion on the abruptness of N. and S. limits of plant ranges.]