1. 1. The connection between the rate of maturity (number of days between birth and production of the first egg) and egg production of 938 White Leghorn pullets, hatched and reared on the Experimental farm of the Oliefabrieken Calvé-Delft was investigated. The pullets were of various strains and received widely differing treatment as regards feeding.

2. 2. There is a curvilinear correlation between rate of maturity and to talproduction and also between rate of maturity and winter production. It is, therefore, not correct to calculate with rectilinear correlations or regressions.

3. 3. The conditions, obtaining during the rearing, influence not only the rate of maturity, but also the connection between the rate of maturity and egg production.

4. 4. It is, therefore, impossible to state any generally acceptable rules concerning the way in which the existing connection can be used to raise the average production by the elimination of certain birds.

5. 5. Even when the pullets have been carefully culled either before or at the commencement of production, it is possible to raise the average production still further by eliminating those birds, which come into production last. A considerable number of bad producers are found among the birds with the slowest rate of maturity.

6. 6. No connection was found between rate of maturity and mortality.

7. 7. Neither was there any connection between rate of nlaturity and the average weight of the eggs produced after December.

8. 8. For the 514 birds which began production after 30th September, 1935, a rectilinear correlation of +0.66±0.02 was found between rate of maturity and the average weight of the first ten eggs produced. The regression-eo-efficient of this “inception egg-weight” to rate of maturity in +0.16±0.02.

The Effect of the Administration of Large Amounts of Vitamin A on the Vitamin A Content of the Hen's Egg. E. M. Cruickshank and T. Moore. Biochemical Journal, Vol. 31, 1937, p. 179.

The administration of cod liver oil to a laying hen at the rate of 10 per cent. of the diet, which was otherwise low in vitamin ‘A’ and carotene, caused the vitamin ‘A’ content of the eggs, as determined by the antimony trichloride method, to be doubled. The vitamin ‘A’ content of the egg resumed its normal level soon after the withdrawal of the cod liver oil from the diet.

A Study of Naturally Infected Field Cases of Avian Typhoid. H. C. Gauger. North Carolina Station Technical Bulletin, No. 53, 1937.

Studies on seven fatal and eight carrier cases of avian typhoid contracted under natural conditions are reported, the details being given in numerous tables. “The external symptoms in the naturally infected field cases as received in various stages of the disease did not vary to any marked extent [from] external symptoms already recorded by other workers. It was possible to recover S[almonella] gallinarum from the blood stream with relative frequency during the fastigial or high fever stage of the disease…. Cases under study yielded S. gallinarum in droppings during the stages of fastigium, decline, and convalescence, indicating the possibility of the perpetuation of S. gallinarum infection of the premises by birds in these stages of the disease. In these studies S. gallinarum was present in relatively large numbers in the fluids of the eyes, posterior nares, and pharynx during the fastigial stage….

Laying Tests in Germany. Jahresbericht über die deutschen Legeprüfungen für Hühner 1935–36. Dr. K. Taut. Archiv für Geflügelkunde, Vol. 11, 1937, No. 5.

There were organised 5 laying tests and 4 flock production tests; they were held from October 16th, 1935, to September 30th, 1936—351 days.