bleaching before nitration there is a loss of spinning quality in the collodion. The author considers that the new collodion can be used entirely in place of the ordinary ether-alcohol collodion. With regard to the properties of the denitrated products they fix all basic colours without mordant and may be regarded as oxycellulose therefore. The density of the thread is from 1.5 to 1.55. The thread of 100 deniers shows a mean breaking strain of 120 grammes with an elasticity of 8-12 p.ct. The cardinal defect of these fibres is their property of combination with water. Many attempts have been made to confer water-resistance (18), but without success. Strehlenert has proposed the addition of formaldehyde (19), but this is without result (20). In reference to these effects of hydration, the author has made observations on cotton thread, of which the following table represents the numerical results: Breaking Strain Mean of 20 experiments Skein of bleached cotton without treatment 825 Skein of bleached cotton without treatment, but wetted 942 Ditto after conversion into hexanitrate, dry 884 The above, wetted 828 The cotton denitrated from above, dry 529 The cotton denitrated as above and wetted 206 The author considers that other patents which have been taken for spinning nitrocellulose are of little practical account (21) and (22). The same conclusion also applies to the process of _Langhans_, who proposes to spin solutions of cellulose in sulphuric acid (23) (24) and mixtures of sulphuric acid and phosphoric acid. GROUP 2. _Lustra-cellulose._--Thread prepared by spinning solutions of cellulose in cuprammonium.