62 PROCEEDINGS OF SOCIETIES. 



Donations to the Library and Cabinet from May 4tli to June 7th, 

 1871:- 



From 



Land and Water. Weekly Tlie Editor. 



Society of Arts Journal. Weekly Society. 



Nature. Weekly Editor. 



Atlienseum. Weekly W. W. E. 



Journal of the Eoyal Institution, No. 6 Institution. 



Ou a Specimen of Liplograpsus pristis with Reproduc- 

 tive Capsules. By J. Hopkinson, F.G.S Author. 



The Medical Directory for 1870 J. W. Stephenson, Esq. 



The Peerage and Baronetage for 1870 Ditto. 



Journal of the Linnean Society, No. 56 Society. 



The Canadian Journal, No. 73. 



Five Slides from Tasmania E. D. Harrop, Esq. 



John Stuart, Esq., and E. G. McLeod, Esq., were elected Fellows 

 of the Society. 



Walter W. Keeves, 



Assist.-Secretary. 



Croydon Microscopical Club. 



At the meeting on Wednesday, February 15th, the President, 

 Henry Lee, Esq., in the chair. Dr. Sti'ong read a paper " On Bone 

 Structure," which the President afterwards described as clear, concise, 

 instructive, and one on which he could desire the contributions of 

 other members to be modelled. Dr. Strong took as the heads of his 

 subject : — 1st, the appearance seen in ordinary transverse and longitu- 

 dinal sectious of bone ; 2ndly, the varieties of bone, and in what they 

 differ; 3rdly, the develoi)ment of bone, how it is formed, how nou- 

 rished, and finally, its chemical composition. A section of the human 

 thigh or arm bone (taken from the centre of the shaft, because the 

 ends present a different appearance) shows that it is covered by a 

 membrane, the periosteum, and that there is a hard layer or ring of 

 bone surrounding a central cavity containing the medulla, fat or 

 marrow — this hard layer or compact tissue, as it is called, being lined 

 on the interior by a membrane, termed the medullary membrane, 

 which serves to support the fat and the nutrient vessels. A thin slice 

 of the " compact tissue " placed under the microscope, exhibits, 1st, 

 some ovoid or circular holes, called " Haversian canals," after their 

 discoverer, Clopton Havers, surroimded by concentric rings. Among 

 these rings, or lamclke, are dark specks, called lacunce, which are in 

 reality minute sjiaces. From these radiate still more minute pores or 

 tubes, called canaliculi, which commimicate with those from neigh- 

 boiTring lacunce. The Haversian canals are the means by which the 

 blood-vessels are carried into the interior of the bone. Of lacunce and 

 canaliculi there is little to be said beyond the fact that they are 

 arranged concentrically roimd their ova'u Haversian canals, and that 

 the lacunce occupying the outer margin of the ring have their canaliculi 

 only ou that side nearest the Haversian canal. Dr. Strong alluded to 

 the views of Dr. Lionel Beale, on the nutrition of bone by particles of 



