70 REPORT — 1844. 



Suggestions for the Observation of Periodic Changes in Animals. 

 By Thomas Laycock, M.D. 



At a previous Meeting of the Association the author communicated to the Medical 

 Section a paper on a general law governing the recurrence of vital phenomena. In 

 illustration of the subject he traced the connexion between the periods of development 

 in various races of the animal kingdom, and those of man as seen in the paroxysms 

 of nervous affection, and particularly of fevers. In the present paper he directs the 

 special attention of naturalists to those changes in animals the periods of which can 

 be best measured, and concerning which a large amount of important and accurate 

 observations can be obtained. The epochs of development and metamorphosis, and 

 the periods passed in incubation, are specially cited as meriting accurate and exten- 

 sive observation, and the author concludes by quoting the system of registration 

 already established in Belgium as deserving imitation and cooperation. 



On the Flora of Yorkshire. By O. A. Moore. 



He commenced by expressing his regret, that owing to the shortness of the time 

 allowed for its completion, the memoirs might appear not quite so perfect in some 

 respects as it otherwise might have been, especially as regards species peculiar to the 

 sea-coast ; all plants, too, were excluded from the list not strictly found on the York- 

 shire side of the Tees in Teesdale. In this list were included 1119 species and 157 

 varieties (many of which latter are considered species by some botanists), exclusive of 

 a few whose claims to be regarded as Yorkshire plants rest on insufficient grounds. 

 The list might be regarded as an appendix to the work of Mr. Baines which appeared 

 four years previously, and which contains an accurate and extensive list of habitats for 

 all the principal flowering plants and ferns of Yorkshire, as well as the Mosses and Cha- 

 racese. In the present report the subsequent labours of botanists had been noticed, 

 and about 87 species and 81 varieties were mentioned, which had not previously ap- 

 peared in any general list. Additional localities were given for some of the rarer species, 

 when only two or three had been previously recorded; and the names of those botanists 

 were mentioned through whose assistance much valuable information on the flowering 

 plants and ferns of Yorkshire was obtained, to which two families the list was con- 

 fined. They were distributed into the following classes : Exoyens — species 808, va- 

 rieties 101 ; Endogens — species 262, varieties 35; Acrogens — species49, varieties 21. 

 To this was appended an analysis of the species and varieties in natural orders. 



The list, which was of considerable length, was then gone through in a cursory 

 manner, the time only permitting the leading points to be alluded to ; and remarks 

 were made on such species as were either very rare or had some peculiarity in their 

 habit or mode of growth. The following were a few of the principal additions men- 

 tioned in the list : — Anemone apennina, Barharea striata ; this species was shown to 

 be common in many parts of the county, especially on the banks of the Don at Don- 

 caster, at York, Smeaton, &c. &c. ; its claims to be regarded as a distinct species 

 were also pointed out. Camelina dentata, Alyssum calycinum, Lepidium Smithii, Di- 

 anthus plumarius, D. delfoides, var. glaucus, Silene anglica, Hypericum perforatum /3, 

 H. maculatum, Vicia orobtis, Alchemilla alpina, Rosa involuta, Epilobium virgatum, 

 Callitriche platycarpa, C. pedunculata /3, Sedum riipesire, Saxifraga geum, Asperula 

 arvensis, Falerianella auricula, Solidago virgaurea (i, Artemisia campestris, Crepis suc- 

 cistBfolia, Hieradum diaphanum x, H. Lapeyrousii, H. prenantlwides, H. rigidum «/3, 

 //. boreale, Criscnta trifolii, Orobanche rubra. This plant was found at Leyburn Shaw 

 by the Rev. — PuUeine, and is another instance of the species not being confined 

 to the basalt. Scrophularia Ehrharti, Melampyrum. pratense /3, Veronica triphyllos, 

 V. Buxbaumii, Mimulus Inteus, Mentha aquatica ji, citrata, M. pulegium, Stachys 

 palusfris, var. /3 ambigua, Primula farinosa, var. pumila. This curious dwarf variety 

 from Hanxwell Moor was exhibited. Chennpodium olidum, C.fidfoUum, C. murale, 

 Atriplex littoralis, A.erecta, A. deltoidea, Halimus portnlacoides, Rumex palustris, R. 

 prate.nsis, R. aqvaficus. This plant was shown to be the common roadside dock at 

 Hawes, Wensleydale, and grew on dry stone quarries, &c. Polygonum mite, Salix 

 rugosa, tenuifolia, Wcigelliuna, Aceras anthropophora, Habenaria chlorantha, Juncus 

 maritimus, ccenosus, obfusifolius, Potamogeton oblongus, plantagineus, Carex paradoxa. 



