10 
In some of the transverse sections, scarcely any of the Haversian systems 
are visible, but only horizontal looped canals, running more or less parallel 
to the exterior of the bone and to each other, and sometimes passing off 
regularly from each side of a main trunk like the branches of an espalier tree. 
The lacunae appear more equally distributed throughout the tissue than is 
observable in older bones, and their canaliculi, especially in fresh bones, are 
not so readily seen. Instead of the transversely-cut canals, with their 
surrounding circular systems of lamina; and lacunae, there is generally found 
only a sort of knotted appearance where a longitudinal trunk is cut across. 
The few imperfect Haversian systems to be met with, are found generally in 
that part of the section which is nearest to the marrow cavity, and surround- 
ing larger canals or "Haversian spaces." 
The appearance of longitudinal-radial sections is not very unlike the 
transverse— a similar net-work of canals more or less parallel to the surface 
of the bone, for the most part with transverse or oblique communicating 
canals. Tangential sections exhibit a more irregular net-work springing 
from the main longitudinal trunks with finer and more polygonal meshes. 
The passage from this young or adolescent condition of bone to the adult 
or aged state appears to be brought about by the absorption of the young 
bone at certain parts, and the formation of " Haversian spaces," which 
become filled up again by successive layers of new bone deposited within, 
accompanied by a fresh growth of lacunae and canaliculi. While this change 
in the longitudinal trunk is taking place, the lateral branches appear not to 
be renewed in proportionate degree, until we often see, in a transverse 
section of aged bone, no lateral communicating trunks, but only circular 
Haversian systems cut across. 
November 18th. — Mr. W. J. Fedden, Vice-President, in the Chair. 
The minutes of the last meeting having been read and confirmed, 
The Rev. J. Whiteside, Mr. T. Isaac, and Mr. T. H. Yabbicom were 
balloted for and duly elected Members of the Society. 
Dr. 0. T. Hudson read a paper a Paper on " Triarthra longiseta." ( Vide 
Monthly Microscopical Journal, February, 1869.) 
December 16th. — Mr. W. J. Fedden, Vice-President, in the Chair. 
The minutes of the last meeting were read and confirmed. 
Mr. W. W. Stoddart, F.G.S., F.C.S., President, then read a paper j 
entitled 1 ' A Microscopical Examination of the Water Supply of the Bristol 
Water Works Company." 
