268 



fitted, is the infusoria. Young charr, under his observation, at- 

 tained their perfect form and became fit to be set at large, to which 

 no food had been given, and were, it is presumed, after the absorp- 

 tion of the yolk, fed and nourished by these microscopic animal- 

 cules. 



In the last section, he submits some remarks on the vexed ques- 

 tion of the Parr, viewed as a species, and comes to the conclusion that 

 till a parr is found propagating its kind, proof must be held to be 

 wanting of the existence of such a fish, a true species distinct from 

 the salmon or sea- trout fry. 



2. On the Structural Character of Rocks. Part III., em- 

 bracing Remarks on the Stratified Traps of the neigh- 

 bourhood of Edinburgh. By Dr Fleming. 



The author referred, in the first instance, to the character of stra- 

 tification, illustrating the subject by specimens displaying the inter- 

 mittent character of the carrying agent and of the supply of mate- 

 rial, pointing out the Hailes Quarry as furnishing the best example 

 in the neighbourhood of the repetitions of strata. He then stated 

 the views of Townson, Whitehurst, and Jameson, as to the relation 

 of the trap rocks to the sandstones with which they are interstrati- 

 fied. He then took notice of a statement in vol. xiii. of the Trans- 

 actions of the Society, recorded by Lord Greenock, that Edinburgh 

 may be considered as a valley of elevation, the trap rocks in the 

 neighbourhood dipping outwards as from a common centre. This 

 opinion, he stated, was true in reference to the rocks on the east 

 and west sides of the city, but not true as to those on the south and 

 north, or at Blackford and Burntisland. 



Dr Fleming then stated that there were nine masses of trap in 

 the neighbourhood, included in the sandstones, all of them having 

 some peculiar structural characters — viz. Calton Hall, Salisbury 

 Crags, Arthur's Seat, Lochend, Hawkhill, Blackford, Craiglockhart, 

 Corstorphin, and Granton. At this part of the paper he made some 

 remarks on the so-called " outburst of trap'' of Inchkeith, stating 

 that the island consisted of at least a dozen of beds of trap alter- 

 nating regularly with acknowledged sedimentary beds of sandstone, 

 shale, and limestone, containing organic remains. 



The author then commenced his survey of the stratified traps of 



