Notice of the A'ppearance of the Bocks at Blue Lick Springs. 161 



after was killed, but no trichince were found in its flesh. Several 

 feedings of the trichinized flesh from the guinea pig, to a sheep, to 

 a chicken, and to a goose, failed to develop any trichince in these 

 animals. 



From his experiments he inferred -that carniverous mammals, and 

 especially those which subsist on a mixed diet, are most liable to enter- 

 tain trichince, and that herbivorous animals are not likely to be so 

 infested, though other experimenters had succeeded in rearing muscle 

 trichince in a calf. 



Some of the trichinized pork from Aurora was exhibited by Dr. 

 Sutton, at the February meeting of the Cincinnati Society of Natural 

 History. It appeared healthy to the naked eye, but under a micro- 

 scope every part of it showed the parasites coiled, twisted, and amassed 

 together. 



Notice of die Appearance of the Rocks at Blue Lick Springs, in Nicholas 

 county, Kentucky. (By G. W. Ransom.) 



A peculiar appearance is presented in the pavement at the fountain 

 at Lower Blue Lick Springs, in Nicholas county, Ky, At the junc- 

 tion of the flags, which are ordinary limestone, there is an elevation of 

 half an inch, with a breadth of about the same extent ; this occurs 

 only at the joints of the stones. It is about twenty years since the 

 pavement was laid, and at that time there Avas no inequality in the 

 surface. What has caused this variation, so uniformly, at the same 

 distance from the edges of the stones ? 



On the Phenomena of Variation and Geographical Distribution as ilhis- 

 trated' by the Papilionidce of the Malayan Region. By Alfred R. 

 Wallace, Esq. [From the Transactions of the Linnean Society, 

 vol. XXV., p. 1.] 



When the naturalist studies the habits, the structure, or the affini- 

 ties of animals, it matters little to which group he especially devotes 

 himself; all alike offer him endless materials for observation and 

 research. But, for the purpose of investigating the phenomena of 

 geographical distribution, and of local or general variation, the several 

 groups differ greatly in their value and importance. Some have too 

 limited a range, others are not sufficiently varied in specific forms, 

 while, what is of most importance, many groups have not received that 

 amount of attention over the whole region they inhabit, wLich could 



