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SECTIONAL TRANSACTIONS.—M. 473 
Preventive and curative experiments, using a vitamin A concentrate, 
definitely proved the trouble to be due to a deficiency of vitamin A in the 
diet. 
Independent experiments at Cambridge and Rothamsted indicated that 
a deficiency of vitamin A in the food of sty-fed pigs may frequently occur 
in practical pig feeding. Since the conclusion of our experiments, examina- 
tions have been made of the reserves of vitamin A in the livers of pigs from 
our experimental animals. ‘These have shown that vitamin A reserves may 
persist for some weeks in the livers after the source of vitamin A in the 
diet had been discontinued. Experiments on the practical value of a single 
dose of vitamin A, after weaning, are being carried out. 
Dr. H. H. Green.—Pig anemia (11.30). 
The Agricultural Research Council has initiated a survey of obscure 
disorders of young pigs and provisional information indicates that pig 
anzmia is one of the commonest of these. ‘The cause and occurrence of 
the disorder are considered in relation to the method of pig-rearing and 
preventive measures are discussed. 
