24 N. H. Age. Experiment Station [Bulletin 256 



made between positive and negative animals in herd Xo. 6 and conse- 

 quently the disease spread very rapidly. Positive and negative animals 

 in herd No. 7 were placed in two different stables, with the result that 

 the number of positive reactors is gradually decreasing because the re- 

 actors are being replaced by the non-reacting heifers they raise. 



Some animals were observed to maintain a natural agglutination 

 indicating suspicious reaction. In one instance a dam and two 

 daughters held to this condition, indicating the possibility of this being 

 a. family trait in their case. {Purnell) 



Further research on contagious abortion by Mr. Martin gave results 

 contrary to reports of other investigators which state that reactors fail 

 to respond to the agglutination test if neutral acriflavin, an aniline dye 

 solution, is injected into their blood stream. Two strongly positive re- 

 actors were treated with this solution by Dr. Martin, but continued to 

 show positive reaction to tests covering a period of two months. {Mis- 

 cellaneous Income) 



Increased interest has been shown in the blood test as a means of 

 controlling and eradicating contagious abortion of cattle. Blood sam- 

 ples tested at the pathology laboratory numbered 3,451 this year, as 

 compared to 841 a year ago. Of the animals tested 17.8 per cent 

 were found infested. The samples were submitted to C. L. Martin by 

 veterinarians in the field. {Miscellaneous Income) 



Treatment of Large Animals 



Large animals treated by C. L. Martin included 26 cattle, 62 horses, 

 34 hogs, and 37 sheep. These were from the stock of the college of ag- 

 riculture; veterinarians in the field also sent in specimens. {Miscel- 

 laneous Income) 



Inspection Service 



Feeding Stuffs Inspection. In the enforcement of the law regulating 

 the sale of concentrated commercial feeding stuffs, 351 brands requir- 

 ing 2,900 individual determinations were analyzed for the State De- 

 partment of Agriculture. 



Fertilizer Inspection. One hundred and seventeen brands of com- 

 mercial fertilizers were analyzed for the State Department of Agricul- 

 ture. These required about 800 individual determinations. 



Miscellaneous Analyses. Samples of soils, feeds, fertilizers, liming 

 material, leaf molds, poisons, etc., have been sent in by residents of 

 the state and by departments of the college of agriculture, and of these 

 187 were analyzed. About 250 individual determinations were nec- 



essary. 



Seed Inspection. During 1930, 410 samples of seed were handled in 

 the laboratory for the State Department of Agriculture. Of these 375 

 were collected by the state inspector. The remaining 35 were private 

 samples. 



Potato Seed Certification. Forty-eight acres of Green Mountain 

 potatoes were entered for certification in 1929, 19 of them failing to 

 meet requirements at the first inspection and five being withdrawn be- 

 fore the second inspection. 



