ON SNOW CRYSTALS. Ill 



No. 5. This had the peculiarity of possessing eight radii, the alternate ones 

 little more than half the length of the others ; all finely feathered ; 

 the diverging lines decreasing as they approach the extremity, as in 

 figure 3. One only of this configuration was observed. It is not fi- 

 gured in the works before us. 



Nos. 6, 7, 8. These are identical with the representations given by Nettis, 

 numbered 62, 78, 79. 



No. 9. Identical with No. 56 of Nettis, but less abundant than the preced- 

 ing. 



No. 10. The spicules of this form (No. 6 of Scoresby, 39 ? of Nettis) were 

 very few in number and about 2i lines diameter. 



No. 11. No. 10 of Scoresby is nearly but not precisely the form which we 

 observed. In ours the radii, instead of maintaining a uniform thick- 

 ness throughout their entire length, gradually expand as they ap- 

 proach the terminating trefoil, and merge into the curves of that 

 figure. They were few in number. Diameter l£ line. This was 

 twice noticed by Scoresby : the thermometer in the first instance be- 

 ing 19°, in the latter 10°. 



No. 12. Identical with figure 15 of Scoresby. Few in number. Diameter 

 2 lines. 



No. 13. No. 20 of Scoresby. One only observed by us. Diameter \\ line 



No. 14. Vide figures 22 and 29 of Scoresby. Neither of these conveys an 

 accurate idea of the form indicated by our No. 14. It had the mar- 

 gin and points opaque, the disk filmy and transparent, as in fig. 59, 

 but the points resembled those delineated in figure 22. Diameter 

 about l£ line. 



No. 15. Here, as in the preceding, it is necessary to combine two of Scores- 

 by's figures, to convey a correct idea of the spicula we mean to re- 

 present. In this instance the radii were feathered as in figure 24, 

 but terminated as in figure 15. One only was observed. Diameter 

 2 lines. 



No. 16. This accords with figure 38 of Scoresby, and occurred to him at a 

 temperature as low as 10°. We observed but one specimen of this 

 form ; it was somewhat opaque. Diameter 2 lines. 



No. 17. A few spicules presented themselves differing from No. 41 of Scores- 

 by in having three instead of two leaflets. Diameter about 2 lines 



No. 18. Fig. 69 of Scoresby. One of this form and opacity was remarked. 

 Diameter about 2\ lines. 



No. 19. Two of Scoresby's figure 95 were found united, forming by their 

 union an irregular figure . 



The weather for some days previous had been frosty, and 

 the barometer gradually falling from about noon on the 12th 

 inst. On the morning succeeding these observations there 

 was snow, followed by showers of sleet, and at noon a heavy 

 rain set in, which continued without intermission the remain- 

 der of the day. 



Since the preceding observations were made we have found 

 that snow crystals are not unfrequent in Ireland, although we 

 are not aware of any published record of their occurrence. — 

 The facts which have led to this conclusion may be briefly 

 stated. 



