i886 87.] yo/tings on a Ramble in Wester Ross. 23 



These results are certainly very wonderful, and the glasses 

 deserve the highest jDraise. The images they give of these 

 tests are undoubtedly clearer and brighter and freer from 

 colour than other glasses of the same magnifying power, and 

 their resolving power is consequently very much increased. 

 The price put upon them, however, by the makers is so 

 excessively high, that they may not become popular ex- 

 cept with those who can afford the luxury of buying them. 

 There are very few, if any, tests resolvable by them which 

 cannot be as easily seen by means of a homogeneous oil- 

 immersion. To see, however, the strife upon Amphipleura 

 pellucida by means of diffused daylight from a north window 

 at 5 P.M. in the month of April with a Zeiss condenser, is 

 certainly what no ordinary oil-immersion would readily do. 



These notes have been written at the request of the editors 

 of our ' Transactions,' although it is feared they may not be of 

 much service to the members of the Society, none of whom 

 may possess apochromatic lenses. The above short detail of 

 the principles involved in their construction, and of defects in 

 previous glasses to which we are indebted for apochromatic 

 lenses, may, however, be interesting to those members of the 

 Society who take a genuine pleasure in the microscope, and 

 everything which tends to improve it. 



Yl.— JOTTINGS ON A RAMBLE IN WESTER ROSS. 



By Mr JOHN ALLAN. 



(Read Jan. 2G, 1887.) 



In the end of July and beginning of August last, I had the 

 pleasure of forming one of a party who, under the auspices of 

 the Botanical Society of Edinburgh, passed a fortnight in 

 investigating the flora of the parish of Applecross, more parti- 

 cularly of that part of it lying on the southern shore of Loch 

 Torridon. Our headquarters were the schoolhouse in the small 

 crofter and fishing hamlet of Arrin-a-chruinach. We met with 

 but a moderate degree of success in our search for plants, 

 not many rare ones being found. Our report on this head, 



