22 N. H. Agr. Experiment Station [Bulletin 262 



Culture generally consists of a triennial burning over. This does 

 not control all weeds and indeed favors the development of certain 

 ones such as brakes, sweet fern, popel, lambkill and iron weed. Diseases 

 and insects are not as yet a serious economic factor although the blue- 

 berry maggot is present. Lack of moisture and lack of fertility are 

 sometimes limiting factors. 



Many growers are satisfied with existing conditions although it would 

 appear that better management would lower costs. (Hatch Fund) 



Pre-Cooling Milk 



Investigations on pre-cooling of milk have been continued by W. T. 

 Ackerman and H. C. Moore with the finding that the condition of the 

 cans used is an important factor. On some farms the cans proved to 

 be a very serious source of bacteria and the sole reason why the farmers 

 could not produce quality milk. Tests showed that only 3 cans out of 

 52 were sufficiently free from bacteria. One farmer, using an electric 

 five-gallon hot-water heater at a cost of 10 cents a day for current, 

 was conditioning his cans after they were returned to him by rinsing 

 them with boiling water. (Pumell Fund) 



Development of White Pine Stands 



Plots of immature white pine, ranging from 10 to 50 years, are being 

 studied by K. W. Woodward as to the results of thinning and pruning 

 over a long period of time. Changes of fauna and flora will be traced 

 in another series of plots, recently established. 



A group of young mixed plots have been observed for the effect of 

 attacks of the Cottontail rabbit. Blue beech, hazelnut and staghorn 

 sumac were attacked approximately 100 per cent. Red maple and red 

 oak were also badly damaged, but no harm was done to white pine, 

 hemlock or gray birch. Trees two inches and over in diameter seem 

 to be safe, while sprouts have but slight chance of surviving. This 

 points to the conclusion that the species attacked will eventually be 

 removed from the stand. (Hatch Fund) 



Root Growth of Pine 



A two-year investigation of the rate of growth of lateral roots of 

 white pine has been completed by C. L. Stevens in collaboration with 

 Yale University, and Bulletin No. 32 has been issued on the work by 

 the Yale School of Forestry. The pine were four to six years of age, 

 planted in open fields. 



In spring and autumn it was found that the growth of the roots was 

 rapid. The most vigorous ones showed a distinct tendency to slow 

 down during midsummer ; the less vigorous ceased growth altogether. 

 Changes in the rate of development during the growing season appear 

 to be due to internal causes or to a combination of environmental fac- 

 tors rather than to midsummer drought. 



Height growth of the parts above ground was practically complete 

 when the rate of root growth slackened in midsummer. There is no 



