On a method of measuring the Angles of Crystals. 



Lat. "78° 37' N., Ion. 70^ 40' W. from Greenwich. 



251 



Month. 



January , 

 February 

 March . . 

 April . . . 

 May . , . , 

 June . . , . 



* * * 



July 



Aug^ust. . , 

 September 

 October - . 

 November 

 December 





Year 



% 



Sprinj 



Autumn * 



Summer 



"Winter - 



Mean tempera- 

 ture of air. 



Barometer, 



- 29-42 



- 27-40 



- 36-03 



- 11-30 

 + 12-89 

 + 29-23 

 + 38-40 



4- 31-35 

 + 13-48 



- 5-00 



- 23-02 



- 31-86 





inch. 



29-801 

 29-868 

 28-777 

 29-942 



29-970 

 29-780 

 29-784 



29-711 

 29*680 

 29-772 

 29-790 

 29-785 



AttacLcd 

 Thermometer. 



- 3-22 





- 11-48 



- 4-85 

 4- 32-99 



- 29-56 



29-805 



29-896 



29-747 

 29-758 

 29-818 



o 



+ 39-48 

 38-29 

 40-84 

 44-82 

 61-62 

 53-98 

 46-67 

 37-66 

 48-54 

 60-68 

 43-16 

 43-17 



4- 45-74 



45-76 

 50-79 

 46-10 

 40-31 





"The preceding tables show tliat the mean temperature of the year 1854 waff 

 1*79^ colder than the mean temperature of the year as derived from twenty months* 

 observations."— p. 426. 



The scientific facts whicli liave been cited from the volumes 

 of Dr. Kane, are but a selection of comparatively dry detail 

 from a work full of incidents in illustration of the topics we 

 have discussed. And whatever the subject, whether icebergs, 

 glaciers, or stormy seas, Esquimaux, walruses, or polar bears, or 

 their own personal life when frigid night settled about the carnp^ 

 or when they sallied forth to battle with stern nature and raise 

 the standard of victory over her frowning heights, the varied 

 scenes stand out in all their reality before the reader pf his stir- 

 ring words. Although the hero of the Arctic has since fallen 

 ^y disease, his triumph was complete ; and in his death, it was 

 followed, as we may trust, by another more glorious triumph 

 above nil thf> p.lnnrla nnri nold and darkness of earth- J. D. D. 



Art, XIX. — A method of measuring the Aiigles of Crystals by refkc- 

 tion without the use of a GomoTneter; by P. Casamajor. 



The method of measuring the angles of crystals by reflection, 

 is well known to be the most accurate that has been 



But goniometers by reflection are costly instruments and, besides 

 not always at hand. For these reasons I have devised the fol- 

 lowing as a substitute ; and I here announce it, believing that it 

 will prove useful to travelling mineralogists who have not goni- 

 ometers with them, and to students who do not wish to incur the 

 e:xpense of buying an instrument. 



