322 Kremers—On the Glassification of Carbon-Compounds. 
1. Formamidine is prepared by the addition of ammonia to 
hydrogen cyanide: 
-H 
+ 
Sh H2 
C — NII o 
^NH; 
2. Guanidine hydrochlorate by the addition of ammonium 
chloride to cyanamide: 
n/NH 2 
+ 
-NH 0 
) ^TT Tinp C-NH.HC1 
l NHjHCl ^ NH 
3. Substituted ammonias can be added in like manner: 
l/NH; 
V ^N 
+ 
H 
;nc 
/NH s 
H = C=NH 
-CH 2 .COOH \NH.CHoCOOH; 
Cyanamide. Amido acetic acid 
or glycocoll. 
C: 
-NIL 
V.- y - 
Cyamine. 
+ ( N(CH 3 )CH 2 COOH : 
Glyeocyamine. 
/NH, 
C=NH“ 
\N(CH 8 )CHoCOOH. 
Methyl glycocoll or 
sarcosine. 
Methyl glyeocyamine or 
creatine. 
The gradual substitution of hydroxy groups for hydrogen and 
the subsequent dehydration certainly demonstrates in an admir¬ 
able manner the genetic relations existing between alcohols, 
aldehydes and ketones, and acids. The gradual substitution of 
the amido group for hydrogen and the splitting off of ammonia 
points out similar relations existing between amines, imines, 
amidines, nitriles, etc. Such a deductive treatment of a large 
field may serve as an admirable introduction to the more de¬ 
tailed study of the series, e. g. of oxygen or nitrogen deriva¬ 
tives of this particular series of hydro-carbons. It becomes 
almost self-evident that these series should be studied in the 
same succession in which they are derived. Nevertheless, it 
will be found at a glance over our more important text and ref¬ 
erence books that this is not the case. Richter e. g. in his 
“ Inorganic Chemistry ” has arranged the material under con¬ 
sideration in accordance with the periodic system, as far as he 
evidently thought he dare. In so far he broke with traditions, 
and in each new edition he has new words of praise for the 
periodic system, not only as a chemical theory, but also as a 
didactic basis. Upon examination of the “ Organic Chemistry, ” 
