Informing JH of a meeting of the Commission on Standards at Somerset House on 28 May 1841.

Comments on additional proposals for consideration by the Standards Commission [see JH's 1841-3-20 or later].

Does not expect to come to the meeting [see GA's 1841-5-18], but sends comments on altered sections of the draft report.

Believes no error should be legally tolerated [see GA's 1841-5-24] in selling goods; thus the seller always provides a trifle over the due quantity.

Has seen John Arrowsmith, who has sent the maps to JH. There is to be a meeting of the Standards Commission.

Has received the maps from John Arrowsmith and sends a blank check for FB to fill in correct amount to pay the bill. Is unable to attend the Standard Commission meeting. Hopes FB can visit him in the summer.

Thanks AD for his theorems; comments on the value of such abstract speculations.

Is in London studying English criminal law. EM was pleased with his visit with JH, and will be telling JH's aunt Caroline about it when he returns to Hanover.

Has been experimenting with paper prepared with light-sensitive vegetable juices. Sends two specimens of JH's results.

JDH informs his father, William Jackson Hooker, that [Ronald Campbell] Gunn has left Hobart [Tasmania, Australia]. It is winter & the only plants are Cryptogamia, the summer was hot; shrivelling vegetation & causing fires that burnt the woods, seeds have been dispersed & some plants are flowering for a second time e.g. Epacris impressa & some Acacia. Recounts a trip up D'Entrecasteaux Channell on the River Derwent to the Huon River with Captain Briggs, to see Huon Pines. The D'Entrecasteaux Channell reminded JDH of the Kyles of Bute, but surrounded by gum trees, Asters & Leucopogon richei & long cutting grass. The plants on the Huon are more alpine with tropical vegetation in deep gullies. He describes some of the ferns, which incl: Allantodia australis, Polypodium vespertilionis, Pittosporum bicolor, Anopterus glandulosus & Sassafras. Also describes some beautiful, very large tree ferns giving dimensions & describing the character of their growth in the valleys. Tree ferns are covered with Psilotum triquetrum, Asplenium laxum, Polypodium grammitidis & Grammitis australis. Mosses in the valleys abound: Hookeria pennata, H. quadrifaria, Hypnum cochleariformis & a new Anomodon. Mentions an island in the mouth of the Huon made completely of fossil shells in sandstone, & on which some Asplenium species grow. Letter also includes a coloured illustration of a new species of Hookeria. The Hookeria was found growing on Dicksonia arborea on the Banks of the Huon River opposite Port Cygnet.