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الصفحة 38 - President, in the Chair. The following were elected Fellows of the Society : IH Cox, MA, Madgalene College.
الصفحة 37 - ... Ptychoderidae, which are enlargements of the annulations ; and by the dermal pits of Spengelia, which are intergonadial depressions of the interannular grooves. In the Enteropneusta and in the Cephalochorda the gonads are more or less coextensive with the gill-clefts, both being primarily unlimited in number. A theory of gill-slits was developed, according to which gill-slits arose in the interannular depressions, while the gonads were disposed in zones corresponding with the epidermal annulations....
الصفحة 228 - If the account just given of the development of the limb is an accurate record of what really takes place, it is not possible to deny that some light is thrown by it upon the first origin of the vertebrate limbs. The facts can only bear one interpretation, viz., that the limbs are the remnants of continuous lateral fins.
الصفحة 234 - These structures have the primary function of Respiration. They are also however provided with an elaborate muscular apparatus comprising Elevators, Depressors, and Adductors, and larvae possessing them may be seen every now and then to give them a sharp backward twitch. They are thus potentially motor organs. In such a Urodele as Amblystoma their homologues on the mandibular arch are used as supporting structures against a solid substratum, exactly as are the limbs of the young Lepidosiren. I have...
الصفحة 12 - B up to the narrowest part (diameter 0.80 in.), and then made conically divergent to the discharging end. The results of the experiments are given in the following table : The fact that B discharges more than A is very noticeable...
الصفحة 185 - PRESIDENT, IN THE CHAIR. The following was elected a Fellow of the Society : AL Bennett, BA, Christ's College.
الصفحة 229 - ... connected by a ridge of Epiblast. I am not able to make out what were the other forms in which Balfour found this ridge, but subsequent research, in particular by Mollier, a supporter of the lateral fold view, is to the effect that it does not occur in such ordinary sharks as Pristiurus and Mustelus, while it is to be gathered from Balfour himself that it does not occur in Scyllium. It appears to me that the knowledge we have now that the longitudinal ridge is confined to the Rays and absent...
الصفحة 233 - ... were serial homologues of the external gills, situated on the mandibular arch. On then looking up the literature, I found that I was by no means first in this view. Eusconi had long ago noticed the resemblance, and in more recent times both Orr and Maurer had been led to the same conclusion as I had been. Three different observers having been independently led to exactly the same conclusions, we may, I think, fairly enough regard the view I have mentioned of the morphological nature of the balancers...
الصفحة 46 - Chemistry," p. 169, discusses this very question. He shows that the effect of the pressure of an inert gas must be to raise the vapour pressure above that given in a vacuum. Taking his formula as being applicable to iodine, the difference between the two conditions of pressure should amount to ?|^ of the whole. Now the question arises, is this amount sufficient to explain the difference of colour or will it be necessary to bring in other factors which may operate, such as solution of solids in gas...
الصفحة 27 - t Hoff*, the osmotic pressure of a solution can be calculated from its vapour pressure by multiplying the difference between its vapour pressure and that of pure water by the ratio of the density of water to the density of its vapour. This gives the osmotic pressure of the salt in the solution, or what is the same thing the diminution of the internal pressure due to the presence of the salt. Assuming that the internal pressure in the solid is diminished by an amount measured by the diminution of...