ANNUAL REPORT, 1937 95 



held every two yeart, an invitation to look over the variety trials at Amherst and 

 VValtham this year was accepted by over 70 seedsmen and Experiment Station 

 workers. The interest shown would seem to indicate that such a meeting might 

 well be repeated in Massachusetts every four years. 



PUBLICATIONS 

 Bulletins 



339 Annual Report for the Fiscal Year Ending November 30, 1936. 100 pp. 

 March, 1937. 



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 genera! and definite conclusions necessary to meet the require- 

 ments of bulletin or journal. 



340 Historical Trend in Massachusetts Industries, 1837-1933. By David 

 Rozman and Ruth E. Sherburne. 31 pp. January, 1938. 



In Massachusetts as in many other states, there have occurred over a period of years 

 shifts in population and in the distribution of industries between individual cities and 

 towns of various sizes. This publication presents a graphic summary of the changes in 

 population, number of industrial employees, and number of industrial establishments 

 during the last hundred years, for those cities and towns of the Commonwealth where the 

 historical data are available. 



341 Vacuum-Pressure Relationships in Glass Canning Jars. By C. R. Fellers, 

 A. S. Levine, and VV. A. Maclinn. 20 pp. April, 1937. 



The present method of canning foods in the all-glass type of fruit jar has several dis- 

 advantages, some of which are overcome by a slight change in method of processing. As 

 a result of a two-year investigation of the vacuums and internal pressures in all-glass 

 canning jars during heat processing and of practical cooperative experience involving over 

 16,500 all-glass jars, 50 canned foods, and 60 home canners. it is considered advisable to 

 recommend sealing the jar by tightening the wire bail previous to thermal treatment 

 (processing). This method decreases markedly the losses of liquid from jars during proc- 

 essing, improves the appearance of the contents, saves time, obviates the necessity of 

 handling the hot jars after processing, and has no effect on either breakage or spoilage. 



342 Facts, Fads and Frauds in Nutrition. By Helen S. Mitchell and Gladys M. 

 Cook. 31 pp. April, 1937. (Reprinted in November.) 



Present-day food advertisements make a tremendous appeal to a nutrition-conscious 

 public which has only a very limited basis for evaluating the merits of the claims made. 

 This bulletin attempts to present in brief and readable form information, decisions and 

 criticisms by recognized authorities concerning nutritional and therapeutic claims in food 

 advertising as well as faulty concepts and notions regarding foods and nutrition, as a guide 

 to the consumer. Sources of reliable information on foods and nutrition are listed. 



343 The Dutch Elm Disease — A New Threat to the Elm. By Malcolm A. 

 McKenzie and William B. Becker. 16 pp. May, 1937. 



At the present time the Dutch elm disease is not known to occur in Massachusetts. 

 However, the oldest known American infestation of the principal carrier insect of the 

 disease, the smaller European elm bark beetle, was discovered in the vicinity of Boston 

 in 1909. With this known carrier already well established in Massachusetts, the elms of 

 the State would be in grave danger of destruction should the Dutch elm disease be in- 

 troduced among them. This bulletin describes the disease and its symptoms, as well as 

 how it is spread, and urges the cooperation of everyone in the efforts being made to pro- 

 tect and preserve the elms. 



344 Inheritance of Egg Size and Egg Character. Bv F. A. Havs. 28 pp. July, 

 1937. 



A study of egg size and egg character, covering nine generations of Rhode Island Reds, 

 is summarized in this report. The data furnish more definite information on the inher- 

 itance of egg size, egg shape, shell texture, shell porosity, and shell color, thus making it 

 possible to offer some specific recommendations to poultry breeders. 



