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The Museu?n Gazette 



CORRESPONDENCE. 



TO THE EDITOR OF THE " MUSEUM GAZETTE." 



Sir, — If you think the following of sufficient interest to put in the 

 Museum Gazette I should be glad if you did so. 



On November 25 last, about mid-day, I was walking with a friend 

 on one of the Llwynmadoc hills called Carnwen. Its beautiful form, 

 with the peak on the top, attracts the attention of all visitors to this 

 neighbourhood, which is in the north of Breconshire. On the south 

 side of Carnwen is a narrow, deep and beautiful valley in which 

 stands Llwynmadoc. On the north side is another deep and narrow 

 valley through which flows the Cammarch, emptying itself into the 

 Irvon at Llangammarch. We were near the top of the hill, looking 

 at the mist slowly moving down this valley, when the sun suddenly 

 shone, and on the mist below appeared a beautiful miniature mist 

 rainbow. Where the sun's rays pierced the mist there was a bright 

 glow of red and yellow, and above, two arcs or circles of most 

 brilliant hues. In the centre was a small dark shadow which we 

 were at a loss to account for until we moved, when we found it was 

 our own. We were filled with wonder and delight as we gazed upon 

 this lovely scene, which lasted for about eight minutes. Is it of rare 

 occurrence in this country ? 



Beulah, Breconshire. JOHN Price. 



January 15, 1907. 



Educational Museum. A Definition.— A collection of objects 

 arranged and described with the special object of enabling the 

 unlearned to acquire information easily. 



Low Power Microscopes. — Messrs. Beck, of Cornhill, inform us, 

 in answer to enquiry, that their Star Microscope for low power work 

 is one which with the sliding body No. 40, and a low power objective 

 comes out at £2 5s., as marked on p. 15 of their catalogue. 



The better form of instrument, with rack and pinion coarse adjust- 

 ment, No. 42, comes out, with one eye-piece and one object glass, 

 at £3. This is figured on p. 17 of their catalogue. 



Sea- weeds and Corallines. — Although, in a general way, sea- 

 weeds are easily distinguished, there may be, it is to be admitted, 

 some difficulty with the true corallines. These curious productions 

 are sea-weeds which encrust themselves with lime. If placed in 

 dilute sulphuric acid the lime salts are dissolved away, and the 



