41 



lished by the Society of Antiquaries of London. Vol. XXXII. — 



From the Society. 

 Quarterly Journal of the Geological Society. No. 15. August 1, 



1848. — From the Society. 

 Monthly Notices of the Royal Astronomical Society. Vol. VIII. 



No. 8. June 9, 1848.— From the Society. 

 Annals and Magazine of Natural History, including Zoology, Botany, 



and Geology. Vol. II. No. 9. Sept. 1848.— From Sir Wil- 

 liam Jardine, Bart. 

 Journal of the Academy of Natural Sciences of Philadelphia. New 



Series. Vol. I. Part 2. — From the Academy. 

 The American Journal of the Medical Sciences. Edited by Isaac 



Hays, M.D. No. XXXII. New Series. Oct. 1848.— From 



Dr. Isaac Hays. 

 The Medical News and Library. Vol. VI. No. 70. Oct. 1848.— 



From Messrs. Lea (^' Blanchard. 

 The African Repository and Colonial Journal. Vol. XXIV. No. 10. 



Oct. 1848. — From the American Colonization Society. 



Mr. Geo. M. Justice exhibited to the Societ}^ a spy-glass, 

 made by Merz and Son, of Munich, which he conceived to be 

 superior in several respects to other instruments of equal mag- 

 nitude. 



The superiority of the instrument he stated to consist in the great 

 perfection of the glasses, combining space-penetrating power, and dis- 

 tinctness of vision ; although the object glass is only If inches in 

 diameter, and the focal length 31 inches. The tubes slide into each 

 other, as in the common spy-glass, thus reducing its length so as to 

 be entirely portable. 



By the simple arrangement of a sliding eye-glass, an increased 

 magnifying power is obtained, which may be so graduated as to give 

 the force of a telescope carrying a magnifying power of about 40. 

 Thus, what is only a spy-glass, fitted for terrestrial purposes, may in- 

 stantly be converted into a telescope for celestial observations ; the 

 coUimation being preserved by marks on the tube. With this glass 

 all the familiar scenery of the moon is clearly defined, and so satis- 

 factory is it, that parts which have been considered tests of powerfiil 

 instruments are distinctly visible. Thus, on the sides and top of the 

 lunar range, known as the Appenines, the crater-form appearances 

 may be seen well defined. Some of the double stars are beautifiilly 

 separated ; and clusters of stars are visible through this instrument 



