IV CONTENTS. 



Page 

 IV. GENERAL SCIENCE. 



33. Discovery of a Remarkable Structure in the Knee-joint of the Echidria 

 hystrix of Australasia. By Mr F. J. Knox. 34. Hydrogen Gas from Salt 

 Mines employed for producing Light, and for Fuel. 35. Natural Gas 

 Lights at Fredonia, ... - - 183 



XXIX List of Patents granted in Scotland since June 14, 1827, - 184 



XXX — Celestial Phenomena from January 1st to April 1st, 1828, - ib. 



XXXI Summary of Meteorological Observations made at Kendal in Sep- 

 tember, October, and November, 1827. By Mr Samuel Marshall, 18G 



XXXIL— Register of the Barometer, Thermometer, and Rain-Gage, kept at 

 Canaan Cottage. By Alex. Aidie, Esq. F. R. S. Edinburgh, - 188 



NOTICES TO CORRESPONDENTS. 



J. R. had better send his Reply to Mr Rumball on the " Position of the Focus 

 in the Eye," to the Philosophical Magazine^ that the error and its correction may ap- 

 pear together ; though we think the paper already contains its own refutation. 



We have received the following Hourly Meteorological Observations 

 on the 17th July 1826 from Germany. 



1. Vienna University Garden — 2. General Fallow's Private Observatory — 3. Wies- 

 senau in Lower Carinthia — 4. M. St Leopold near Vienna. — 5. Newstadt, near 



Vienna 6. Alpine Region of the Schneeberg on the frontiers of Austria and Styria. 



7. Lay bach 8. Gorrie — 9. Prague. 



For the 15th January 1827 from 



I. Vienna University Garden — 2. Neuthor Bastey — 3. Laybach— 4. 



Rosalia Capelle near Forchtenau. — Watch-house on the Hohenleuthe 6. Baden. 



An Amateur in Meteorology will, we trust, excuse us for not publishing 

 the Meteorological Journal which he has sent. If he has no objection we shall 

 willingly print an abstract of it. We could fill twenty consecutive numbers with 

 very valuable Meteorological registers ; but we doubt if the occupation of even a small 

 part of each number with such materials would either promote science or gratify our 

 readers. 



We agree with a Constant Reader that our Small Type is rather too 

 minute for a winter evening and for eyes turned of fifty, but we cannot alter it at 

 present, though we may diminish the quantity of it. At the end of No. XX. or Vol. 

 X. we shall begin a new series, and shall consider seriously his proposal. 



A's interesting paper on the Cold Caves of Monte Testaccio at Rome will appear 

 in oiu: next, as the present number was filled before its arrival. He will find the 

 barometrical observations at the Observatory for several years in Blackwood's Ma- 

 gazine, and in the Edinburgh Magazine — He is requested to notice an error in p. 

 137 of the proof sent to him in the sum divided by 18, which affects his general m» 

 suits We have therefore divided his paper, the remainder of which will appear in 

 next number. In answer to his question we beg to inform him. Kitchener's Pan- 

 cratic eye tube has many advantaged. It was described long ago in Dr Brewster's 

 Treatise on Optical Instruments. 



