68 MASS. EXPERIMENT STATION BULLETIN 347 



lene base oils and waxes were less effective than the more refined forms. Although 

 the safety of these materials to plants has not been definitely determined, no 

 serious injury has resulted so far. 



In cooperation with the Boston Edison Company, an electrically controlled 

 fumigating stove for use with naphthalene and similar compounds was developed 

 and tested. This unit, which was composed of electric heating elements and a 

 container for the fumigant, was designed to fumigate 7,000 to 10,000 cubic feet. 

 The heat was adjusted by a series of contact switches and a rheostat having a 

 range of approximately 75 to 175 watts, producing a temperature of 150° to 

 400° F. in the fumigant. When this unit is adjusted, the fumigant will be va- 

 porized at a uniform rate automatically. The operating cost for these units is 

 surprisingly low but at present the manufacturing cost is high. 



FEED CONTROL SERVICE 

 Philip H. Smith in Charge 



The Feed Control Service comprises not only feed inspection, but several other 

 activities, as listed below: 



Feed Control (General Laws, 1920 Chapter 94) 

 Seed Control (General Laws, 1927 Chapter 94) 

 Dairy Law (General Laws, 1920 Chapter 94) 

 Advanced Registry Testing 

 Miscellaneous Work 



Feed Control. (P. H. Smith, A. F. Spelman, J. VV. Kuzmeski, F. A. McLaughlin, 

 J. T. Howard.) During the fiscal year 1,791 samples of feeding stuffs were officially 

 collected and examined in the control laboratories. The gross receipts from the 

 registration of feeding stuffs in 1937 (calendar year) were $23,020, derived from 

 1,151 brands at $20 each. 



Dairy Law. (P. H. Smith, J. T. Howard, H. L Allen.) During the year ending 

 December 1, 1937, 6,686 pieces of Babcock glassware were tested. Condemned 

 glassware consisted of one pipette. One hundred certificates of proficiency were 

 awarded; and 224 creameries, milk depots, and milk inspectors' laboratories were 

 visited in order to check methods and pass upon equipment in use. As a result of 

 this inspection, one machine was condemned. 



Advanced Registry Testing. (P. H. Smith.) Advanced registry testing has 

 been supervised by this department since its beginning in 1902. There are now on 

 yearly test 386 cows located on 45 different farms. This does not include the herd 

 tests where all animals in each herd are placed on test. There are 39 of these, 

 6 of which are supervised by men sent out from this office and 33 by cow-test 

 association supervisors. 



Miscellaneous Work. (P. H. Smith, A. F. Spelman, J. W. Kuzmeski.) Numer- 

 ous analyses have been made for residents of the State and other departments of 

 the college. 



