24 N. H. Agr. Experiment Station [Bulletin 289 



make it a question as to whether pneumatic tires with lug equipment wer(5 

 any more comfortable to the operator than steel equipment. {IV. T. Acker- 

 man and G. M. Foiilkrod — Purnell Fund.) 



Forest Plantations 



Since 1913 plantings of white pine, Scotch pine, red pine, European 

 larch, white ash, white spruce, Norway spruce, and Douglas fir have been 

 made but depredations have ruined all the plantings except white pine, red 

 pine, and Scotch pine. Partial plantings of white ash remain. Field mice 

 have been one of the chief enemies of the latter, and Christmas tree thieves 

 make it hard to maintain spruce stands. (K. W . Woodward — Hatcli Fund.) 



White Pine Plots 



These plots, both plantations and natural regenerations, now include 

 stands which started in 1924, 1918, 1917, 1903, 1890, 1880, 1860, and 1800 

 respectively. They are being regularly maintained and measured. 



An experiment to determine what happens on cut-over areas with ample 

 provision for reseeding has been carried on since 1924. The area lying 

 southeast of 60-year old seed trees was cut over in 1922. but nothing 'was 

 done until 1924 to be sure that the Pales weevil would not kill any of the 

 pine seedlings that might start. At that time one plot had all the brush burnt, 

 one had only limbs marketable as cordwood taken off, and one allowed to 

 remain with brush scattered all over it. After ten years, reproduction is 

 twice as abundant on the area which had all the brush burnt as on the other 

 two areas, and valuable species like white ash and aspen are better repre- 

 sented. First raspberries and then cherries came up in the brush piles and 

 kept out better tree species. {K. W. IVoodzvard — Hatch Fund.) 



Fence Post Durability 



An examination was made after five years of a trial white pine fence. 

 Untreated posts were 75%- decayed; brush treated 11%; open tank com- 

 pletely treated, and ZMA (a zinc arsenate compound), treatments all sound. 

 The decay varied all the way from one-half inch radially to complete break- 

 down at the surface of the ground, (/v. W. Woodward— Hatch Fund.) 



Skin Vaccination for Chicken Pox 



Last year's work showed that it was not satisfactory to vaccinate chicks 

 for the prevention of fowl pox, at six weeks of age, and immediately place 

 them on range, particularly during the early spring months, the period of 

 inclement weather. It caused a decided drop in feed consumption and a 

 consequent retarding of growth. This year chicks on a commercial poultry 

 farm were vaccinated at eight weeks of age and were kept confined to the 

 brooder house for two weeks following vaccination before they were placed 

 on range. This caused no upset in the chicks. 



From this it is concluded that unless chicks can be kept for two weeks 

 in the brooder house following vaccination, it is better to vaccinate them on 

 range after they are 12 weeks of age and before they come into production. 



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