any of the above formulae for the cellulose nitrates. Prof. G. Lunge
gives the following list of nitration products of cellulose:--

[Footnote A: The penta-nitrate C_{12}H_{15}O_{5}(NO_{3})_{5} = 12.75 per
cent. nitrogen.]

[Footnote B: In the Cordite Trial (1894) Sir F.A. Abel said, "Before 1888
there was a broad distinction between soluble and insoluble nitro-
cellulose, collodion-cotton being soluble (in ether-alcohol) and
gun-cotton insoluble." Sir H.E. Roscoe, "That he had been unable to make a
nitro-cotton with a higher nitrogen content than 13.7." And Professor G.
Lunge said, "Gun-cotton always contained soluble cotton, and _vice
versa_." These opinions were also generally confirmed by Sir E. Frankland,
Sir W. Crookes, Dr Armstrong, and others.]

Dodeca-nitro-cellulose C_{24}H_{28}O_{20}(NO_{2})_{12} = 14.16 per cent.
nitrogen. (= old tri-nitro-cellulose)
Endeca-nitro-cellulose C_{24}H_{29}O_{20}(NO_{2})_{11} = 13.50 per cent.
nitrogen.
Deca-nitro-cellulose C_{24}H_{30}O_{20}(NO_{2})_{10} = 12.78 per cent.
nitrogen.
Ennea-nitro-cellulose C_{24}H_{31}O_{20}(NO_{2})_{9} = 11.98 per cent.
nitrogen.
Octo-nitro-cellulose C_{24}H_{32}O_{20}(NO_{2})_{8} = 11.13 per cent.
nitrogen. (= old di-nitro-cellulose)
Hepta-nitro-cellulose C_{24}H_{33}O_{20}(NO_{2})_{7} = 10.19 per cent.
nitrogen.
Hexa-nitro-cellulose C_{24}H_{34}O_{20}(NO_{2})_{6} = 9.17 per cent.
nitrogen.
Penta-nitro-cellulose C_{24}H_{35}O_{20}(NO_{2})_{5} = 8.04 per cent.
nitrogen.
Tetra-nitro-cellulose C_{24}H_{36}O_{20}(NO_{2})_{4} = 6.77 per cent.
nitrogen. (= old mono-nitro-cellulose)

It is not unlikely that a long series of nitrates exists. It is at any
rate certain that whatever strength of acids may be used, and whatever
temperature or other conditions may be present during the nitration, that
the product formed always consists of a mixture of the soluble and
insoluble nitro-cellulose.

Theoretically 100 parts of cotton by weight should produce 218.4 parts of
gun-cotton, but in practice the yield is a good deal less, both in the
case of gun-cotton or collodion-cotton. In speaking of soluble and
insoluble nitro-cellulose, it is their behaviour, when treated with a
solution consisting of 2 parts ether and 1 of alcohol, that is referred
to. There is, however, another very important difference, and that is
their different solubility in nitro-glycerine. The lower nitrates or
soluble form is soluble in nitro-g