1895.] H. H. Godwin-Austen —Notes on Indian Land Mollusca. 151 
6. The bleaching of colours takes place less .rapidly when the 
colours are in solution than when they are dyed on fabrics. 
7. The bleaching of colours in solution takes place less rapidly if 
the living germs or organisms in the solutions are destroyed by boiling 
than if they be not so destroyed. 
8. The bleaching action of light appears to be more powerful if 
the colours are in contact with an organic fabric than if they are used 
to colour inorganic materials (asbestus). 
9. The bleaching action of light in presence of air is much facili¬ 
tated by the presence of moisture in contact with the colours and more 
particularly of evaporating water in contact with dyed fabrics. 
10. There can therefore be little doubt that the bleaching action 
of light on ordinary organic colouring matters is usually due to oxidation. 
This oxidation when facilitated by evaporating water is probably or almost 
certainly due to the action of ozone, for Gorup von Besanez has shown 
that ozone is invariably formed when water evaporates in the air.* It 
therefore appears highly probable also that the action of the sunlight 
on the oxygen of the air brings it into an active condition (resembling 
perhaps that of ozone), and that the bleaching of organic colours is due 
to oxidation from this cause; for ordinary oxygen uninfluenced by 
sunlight does not bleach. 
No. 3 . Notes on, and drawings of, the animals of various Indian Land 
Mollusca (Pulmonifera ).—By Lieut.-Colonel H. H. Godwin-Austen, 
F.R.S., F.Z.S., &c. 
[Read 3rd April.] 
Plate VII. 
Continued from J. A. S. B., Pt. ii., Vol. LI, 1882, p. 71. 
After the long lapse of 12 years since publishing my second paper 
(in 1882), on the drawings of Indian Land-Mollusca made by native 
artists under the superintendence of Ferdinand Stoliczka, I now 
forward a third, with the hope that it will lead some of our younger 
naturalists to make notes and drawings, and if possible dissections, of 
Indian species, so that they may be more accurately placed in generic 
position. 
The first I have to notice and reproduce on Plate vii, fig. 1, is No. 29 
of Ferd. Stoliczka’s drawings, a very careful and accurate one of Helix 
octhoplax, with his MS. note attached,— “ Asalu ; sent down by Major 
God win-Austen.” In 1869 I was surveying in the Naga Hills and 
# Ann. Chem. Pharm. clxi. 232; also Roscoe and Schorlemmer Treatise on 
Chemistry Vol. I., p, 200. 
