CONTENTS. 



I. — On the Development of the Vascular Tissue of Plants. By Edwin J. 



Quekett, Esq., F.L.S., B.S., &c. - - - - 1 



II. — On the vascular arrangement of the Capillary Vessels of the Allantoic! and 



Vitelline Membranes in the Incubated Egg. By J. Daleymple Esq. 12 



III. — On a new variety of Vascular Tissue, found in a Fossil Wood from the 



London Clay. By James Scott Bowerbank, Esq., F.G.S. - - 16 



IV. — On certain Phenomena observed in the genus Nitella, as illustrative of the 

 peculiar structure recently discovered by Mr. Bowerbank, in a Fossil 

 Wood from the London Clay. By Arthur Far re, M.D., F.R.S., 8ns. 19 



V. — On the Structure of some Tissues possessing Hygrometric Properties. By 



E. J. Quekett, Esq., F.L.S., B.S., &c. - - - -23 



VI. — On the Keratose or Horny Sponges of Commerce. By James Scott 



Bowerbank, Esq., F.G.S., &c. - - - - 32 



VII. — The process of charring Vegetable Tissue as applied to the examination 

 of the Stomata in the Epidermis of Garden Rhubarb. By the Rev. J. 

 B. Reade, M.A., F.R.S. 40 



VIII. — On the Anatomy of four species of Entozoa belonging to the genus 

 Strongylus, from the Delphinus phocaena, or common Porpoise. By 

 John Quekett, Secretary to the Microscopical Society. - 44 



IX. — On the minute Anatomy of the Larva of Anthomyia canicularis, Meigen. 



By Arthur Faere, M.D., F.R.S. - - - - - 51 



X. — Observations on the Structure of Bats' Hair. By John Quekett, Secre- 

 tary to the Microscopical Society. - - - - - 58 



XL — On three species of Sponge containing some new Forms of Organization. 



By James Scott Bowerbank, Esq., F.G.S., &c. - - - 63 



XII. — On Fossil Xanthidia. By Henry Hopley White, Esq. - 77 



XIIL— On a New Species of Fossil Xanthidium. By H H. White, Esq. - 87 



XIV. — Observations on the Young of a Species of Ixodes, from Brazil. By 



George Busk, Esq. - - - - - - -88 



XV, — On the minute Structure of certain substances expelled from the human 

 Intestine, having the ordinary appearance of shreds of Lymph, but con- 

 sisting entirely of filaments of a Confervoid type, probably belonging to 

 the genus Oscillatoria. By Arthur Faree, M.D., F.R.S. - - 92 



