180 
DE. E. FEANEZiAND ON A NEW SEEIES OF 
Calculated. 
A 
Found. 

I. 
II. 
III. 
Mean. 
36 
49-39 
49-99 
49-56 
49-77 
• 
12 
16-46 
16-80 
16-68 
16-74 
N. . 
14 
19-20 
19-07 
19-07 
B . . 
10-9 
14-95 
14-42 
72-9 
100-00 
100-00 
The excess of carbon, and to some extent also that of hydrogen, in these analyses is 
doubtless due to the retention of a small amount of ether by the crystals, the great 
volatility of the latter preventing any protracted exposure over sulphuric acid ; but the 
substance used in No. II. was exposed for a much longer time than that employed in 
No. I. 
Ammonia-boric methide is deposited from its ethereal solution in magnificent arbo- 
rescent crystals, which rapidly volatilize without residue when exposed to the air. They 
possess a caustic and bitter taste, and a very peculiar odour, in which both the smell of 
ammonia and of boric methide can be recognized. Ammonia-boric methide fuses at 
56° C. and boils at about 110° C. In a current of air, or better, of carbonic acid, it 
sublimes at a very gentle heat, and condenses in magnificent arborescent crystals. 
Determinations of the specific gravity of its vapour, at three different temperatures, 
gave the following results : — 
Weight of ammonia-boric methide used '0580 grm. 
I. II. III. 
Observed volume of vapour . . 57‘9 cub. cent. 58’6 cub. cent. 69‘9 cub. cent. 
Temperature of oil-bath . . . 119°‘0 C. 130°'0C. 139° C. 
Height of mercury inside of tube 
above that outside .... 99-9 millims. 93T millims. 88'5 millims. 
Height of barometer 761 ‘8 millims. 
Height of column of cold oil 307 millims. 
From these data the specific gravity of the vapour was calculated to be 
I. II. III. 
1-251 1-258 1-250 
These numbers indicate that the vapour of ammonia-boric methide consists of equal 
volumes of boric methide and ammonia united without condensation : — 
1 vol. Boric methide . . . 1-93137 
1 vol. Ammonia .... -5873 
2)^r8'67 
1-25933 
Thus the formula of ammonia-boric methide is a four-volume formula*, a state of 
