Final answer:
According to the Time Traveller in H.G. Wells's 'The Time Machine,' contagious diseases are not lacking in the future, potentially due to reduced human populations and different living conditions which are not conducive to the spread of such diseases.
Step-by-step explanation:
The question is pertaining to a specific chapter in H.G. Wells's novella 'The Time Machine.' The Time Traveller, a character in the story, provides insights into the future world he has visited. When analyzing what the Time Traveller found to be absent in the future, one must draw upon the text itself. The provided reference materials discuss the historical prevalence and transmission of contagious diseases in relation to human population density, living conditions, and societal changes such as urbanization and the development of agriculture.
Based on this context, it is reasonable to infer that in the hypothetical future described by the Time Traveller, the lack of large, densely packed human populations might suggest a decrease in the prevalence of contagious diseases that thrived in such conditions. This is supported by the fact that pathogens like the measles virus require a large contiguous population to sustain itself, and with the advent of settlements, urban growth, and increased travel, such diseases became more common.
Thus, it is correct to say that, according to the Time Traveller, contagious diseases are not lacking in the future; instead, they might be less prevalent due to changes in human society and settlement patterns.