This immunity is apparently not due to the absence of favourable conditions, but rather to the presence of some inimical factor which prevents the development of the parasite.
The dark tint of the bronze rather prevents the niello from showing out distinctly.
It prevents the precipitation of many metallic hydroxides by caustic alkalis.
What prevents the work of Surius from being regarded as an improvement upon Lippomano's is that Surius thought it necessary to retouch the style of those documents which appeared to him badly written, without troubling himself about the consequent loss of their documentary value.
This prevents indeed any continuity of policy, for the majority in congress is perpetually fluctuating, and ministerial crises rapidly follow one another.
