ANNUAL REPORT, 1940 109 



369 Annual Report for the Fiscal Year Ending November 30, 1939. 

 104 pp. February 1940. 



The main purpose of this report is to provide an opportunity for 

 presenting in published form, recent results from experimentation 

 in fields or on projects where progress has not been such as to 

 justify the general and definite conclusions necessary to meet the 

 requirements of bulletin or journal. 



?70 Transmissible Fowl Leukosis. A Review of the Literature. By Carl 

 Olson, Jr. 48 pp. April 1940. 



There is considerable uncertainty as to the relationship between 

 the various diseases grouped under the term "fowl leukoses," due 

 partly to the varying results obtained by different investigators and 

 also to the indiscriminate use of terms. This review of the liter- 

 ature was prepared in the hope that it might help to clear up this 

 confusion and thus lead to a better understanding of these diseases — 

 a necessary preliminary to the development of control measures. 



371 Cranberry Growing in Massachusetts. By Henry J. Franklin 44 pp. 

 June 1940. 



Directions for growing cranberries, from the selection and prep- 

 aration of the land to the harvesting and marketing of the berries, 

 with photographs illustrating all important points. 



372 The Mcintosh Drop. By Lawrence Southwick. 19 pp. May 1940. 



Among the factors considered, methods of culture which produced 

 the most vigorous growth and heaviest yields also had a tendency 

 to increase drop. Apples with many seeds tended to hang longer 

 than those with fewer seeds. Experiments with several chemical 

 sprays were successful in delaying or preventing drop, but further 

 study is needed to determine whether this method is practical for 

 general orchard use. 



373 Foods and Public Health. By James E. Fuller. 16 pp. May 1940. 



The aim of this bulletin is to present fundamental information 

 about food-borne diseases in a manner comprehensive yet simple. 

 Only those food-borne diseases are discussed that are important 

 in the every-day life of the average community-. Diseases that 

 occur only rarely or not at all in our country are not included. 



374 Minerals in Nutrition. 40 pp. August 1940. 



Several departments in the Experiment Station have been co- 

 operating in studies designed to add to our knowledge of minerals 

 in foods, particularly the relation of minerals to certain disabling 

 diseases such as arthritis and hardening of the arteries. The follow- 

 ing papers are included: 



I. Total nutrients and minerals in human and cattle foods. 



II. The absorption by food plants of certain chemical elements 

 important in human physiology and nutrition. 



II L Possible relationship of Vitamin C and arthritis. 



IV. The efTect of kelp and mineral supplements on atheroscler- 

 osis in rabbits induced by feeding cholesterol. 



V. Effect of added iodine on the enzymes of milk and on otlier 

 enzymes. 



\T. Added iodine in milk and fecal bacteria. 

 VII. Iodine and bacterial counts in milk. 



375 Biological Control of Mealybugs in Grecnliouses. By W. D. Whit- 

 comb. 22 pp. July 1940. 



Laboratory studies demonstrated the possibility of biological con- 

 trol of mealybugs by the use of the imported ladybird beetle, Crypto- 

 laenius montrouzicri, Muls.. and indicated some of the conditions neces- 

 sary for success. Tests were then made in greenhouses to de- 

 termine whether and under what conditions this method of control 

 is practical in commercial practice. 



