Nature . t paper, by , Edie, and Abram, more directly illustrates the appli-cation of chemical studies to the elucidation of find that the administration of a neutralised acid ex-tract of the duodenal mucous membrane counteracts diabetesin the few cases examined up to the present. The ex-planation advanced of the benefit is that the extract stimu-lates the pancreas to form that internal secretion whichregulates carbohydrate metabolism, but which is apparentlyin abeyance in the diabetic state. Enough has been said to show the interesting andimportant kind of material at ha
Nature . t paper, by , Edie, and Abram, more directly illustrates the appli-cation of chemical studies to the elucidation of find that the administration of a neutralised acid ex-tract of the duodenal mucous membrane counteracts diabetesin the few cases examined up to the present. The ex-planation advanced of the benefit is that the extract stimu-lates the pancreas to form that internal secretion whichregulates carbohydrate metabolism, but which is apparentlyin abeyance in the diabetic state. Enough has been said to show the interesting andimportant kind of material at hand, and we wish ourtwo new contemporaries every success in the future. March 15, 1906] NATURE 475 FORESTRY IN THE UNITED United States Geological Survey has already issuedin the form of reports various papers dealing withthe conditions of the localities in the more important forestreserves. Professional Paper No. 29 of the forestry seriesof the department deals with the forest conditions in the. ed Valley in the Woodland Area of the Lincoln Forest Re Absaroka division of the Yellowstone Forest Reserve, Mon-tana, and the Livingstone and Big Timber report first treats of the location, extent, andtopography of the Yellowstone Reserve. The forest itselfis almost wholly coniferous, consisting of pines, spruce,silver and Douglas firs. A most interesting account is givenconcerning the distribution of thesespecies, especially in regard to alti-tude and aspect. As regards the agesof the trees the greatest diversityprevails. Age classes occur, varyingfrom 15 to 20 years, 75 to 100 years ;also stands from 200 to 300 yearsold are represented, this condition ofthings having been brought about byfire, the different age-classes corre-sponding to burns of different character and volume of mer-chantable timber are next carefullygone into. These naturally varyaccording to the species of tree, aswell as the altitude and aspect inwhich it is growing, and the
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