ANNUAL REPORT, 1933 63 



PUBLICATIONS 



Bulletins 



293 Annual Report for the Fiscal Year Ending November 30, 1932. 68 pp. 

 March, 1933. 



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. 



294 Recreational and Forestry Uses of Land in Massachusetts. David Rozman. 

 20 pp. illus. January, 1933. 



During the last few decades there has been a considerable decline in the land area under 

 cultivation in the State of Massachusetts; and largely as a result of this abandonment of 

 farm land, about one third of the total area in towns with a population of less than 10,000 

 is owned by non-residents. In towns situated on the Coast and in some inland towns, 

 especially in Berkshire County, such land is utilized to a great extent for recreational pur- 

 poses; but in most other areas, land owned by non-residents is represented by idle acres 

 covered by brush and inferior woods The development of recreational uses in communities 

 with a large area of idle land benefits the local population bj' providing a greater amount 

 in tax receipts, a local market for agricultural products, and some employment for local 

 people; yet in some cases lack of interest in local institutions and competition with the 

 farmers for hired labor may be detrimental. However, even with the increase in recreational 

 uses and part-time farming which may be expected with the increase in good roads, the 

 greater part of this idle land will have to be used for the growth of trees. Already there 

 is a considerable area in state and town forests and small areas held by various public 

 organizations. Care should be taken in increasing these holdings to see that the areas 

 taken are not likely to be needed for other developments, such as part-time farming and 

 summer homes. 



295 The Immunology of Infectious Laryngotracheitis. Charles S. Gibbs. 

 20 pp. illus. May, 1933. 



In order to be acceptable to the majority of poultrymen, treatments for infectious laryngo- 

 tracheitis must be cheap, easy to administer, and fairly effective. Intravenous and sub- 

 cutaneous methods of stimulating immunity did not measure up to this standard, and are 

 therefore not recommended for field practice. Under laboratory conditions, the inocula- 

 tion of the bursa of Fabricius appears to be the most satisfactory method of immunizing 

 birds against this disease. Only birds in the best of health are suitable for vaccination, 

 which is best administered when the birds are between three and four months old. Care- 

 fully controlled experiments are needed to determine the practical value of this method of 

 vaccination under range conditions as well as the duration of immunity in fowls in heavy 

 production. 



296 Effect of Manufacturing and Preserving Processes on the Vitamins of 

 Cranberries. Paul D. Isham and Carl R. Fellers. 19 pp. illus. May, 

 1933. 



Cranberries are an important crop in Massachusetts. Nearly all of them are processed 

 in some way before they are consumed. This study was undertaken to determine the 

 effect of various methods of processing on their nutritive value. Both fresh and frozen 

 cranberries are a very good source of vitamin C, the minimum protective dose for young 

 guinea pigs being 3.5 to 4.5 grams daily. Whole-fruit cranberry sauce retains approx- 

 imately three fourths of the vitamin C of the fresh fruit; but strained sauce, evaporated 

 cranberries, and cranberry juice are poor sources of this vitamin. A four months' storage 

 period at 40° F. caused a loss of 20 per cent in vitamin C content. There is a small but 

 definite amount of vitamin A in cranberries; but vitamins B, D, and G are either absent or 

 present only in traces. The study showed that handling and manufacturing methods may 

 greatly alter the nutritive value of cranberries and cranberry products. 



