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12.
NOTES ON THE SAFEGUARDING AND CONSERVING CULTURAL MATERIAL IN THE FIELD
(xii) [[underlined]] Gases [[/underlined]].
(a) Those like sulphur dioxide and hydrogen sulphide present in small amounts in industrial atmosphere.
(b) Toxic war gases.
(xiii) [[underlined]] Mold [[/underlined]]. Mildew, small plants, fungi and lichens, which utilize a material as food, causing discoloration and decomposition.
(xiv) [[underlined]] Insects [[/underlined]].  Beetles, weevils, borers, termites and their larvae, which infest organic material.

This again appears a formidable list, but there is comfort in the fact that some of these agents of destruction such as blast and toxic war gases are not very likely to operate; the others are unlikely to be active all at the same time; and some, such as dampness and mold, are casually connected, and may be guarded against by similar treatment.
The causes of the above listed agents of damage and destruction may be:-
(i) Natural forces
(ii) Military and police measures
(a) Repressive, involving the use of explosives, such as tear gas, and water.
(b) Constructive, such as building, making roads, drainage, etc.
(iii) Carelessness and ignorance