50 Years Ago
Dr Passey states … that the fact that the incidence of cancer of the oral cavity is relatively stable while cancer of the lung is increasing speaks against a direct carcinogenic action of tobacco smoke because the contact of tobacco smoke is greater in the oral cavity. For one thing, the incidence patterns of these two cancer sites cannot be strictly compared with cigarette smoking, for oral cavity cancer has been shown to relate to cigar and pipe smoking as well as to tobacco chewing, the former two having a relatively small relationship to lung cancer. What has changed in the last 20–30 years is not so much the number of tobacco users as the number of cigarettes smoked. Perhaps more pertinent is the fact that the absorption of particulate matter of tobacco smoke for which carcinogenic activity has been demonstrated in animals is significantly greater in the lungs than within the oral cavity of man.
100 Years Ago
The third annual report of the Nursery and Market Gardens Industries Development Society, Turner’s Hill, Cheshunt, shows that continuous progress is being made in the application of science to horticultural practice. The fertiliser experiments are of considerable interest, and bring out the marked effectiveness of nitrogen compounds, especially of stable manure, in the growth of cucumbers, and their relative ineffectiveness in the growth of tomatoes. It is not definitely settled whether this result arises from some fundamental difference in the method of nutrition of the two plants, or simply from the relative drafts they make on the soil. The ineffectiveness of phosphates, both on cucumbers and tomatoes, is remarkable, and merits closer attention. An important technical matter is the demonstration that a relatively inexpensive mixture of artificial fertilisers gave larger returns than a mixture made by some of the best growers based on the best practice of the district.