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Title
50 & 100 years ago.
Abstract
The article features news items from half-centennial and centennial issues of the Journal. The fifty year old issue focuses on graft transplant between two different members of the same species, and mentions the role of deoxyribonucleoproteins, and nuclear substances as antigens responsible for skin transplantation immunity; The centennial issue presents the importance of sleep and recreation and the value of rest physiologically.