. Bulletin of the Department of Agriculture. Agriculture; Agriculture. SAP-STAIN, MOLD, AND DECAY IN GREEN WOOD. 47 EXPERIMENTAL DIPPING OF KED-OAK BLOCKS AT THE LABOKATOKY OF FOREST PATHOLOGY, MADISON, WIS. A comparison of the specific antiseptic values of the chemical sub- stances employed in the spoke-dipping experiments can hardly be made, since these substances were not used in solutions of uniform strength. To determine, if possible, the comparative values of these and several other common antiseptics and preservatives in the control of mold and sap-stain fungi, several series of ex
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. SAP-STAIN, MOLD, AND DECAY IN GREEN WOOD. 47 EXPERIMENTAL DIPPING OF KED-OAK BLOCKS AT THE LABOKATOKY OF FOREST PATHOLOGY, MADISON, WIS. A comparison of the specific antiseptic values of the chemical sub- stances employed in the spoke-dipping experiments can hardly be made, since these substances were not used in solutions of uniform strength. To determine, if possible, the comparative values of these and several other common antiseptics and preservatives in the control of mold and sap-stain fungi, several series of experiments were undertaken at the Madison laboratory. AVhere possible, solu- tions were made up to a calculated value of 1 per cent actual weight of anhydrous salt. The hygroscopic substances—sodium chlorid, calcium chlorid, and glyc- erin—were added in certain instances to determine whether or not they would increase the efficiency of the preservative by keeping the surface of the treated wood moist. A list of the substances used follows :. Fig. 21.—Storage of spokes in a warehouse. The truck spokes at the left have just been painted by girls with a resin-linseed oil mixture to prevent checking. Alum (potassium). Ammonium fluorid. Bleaching powder. Borax. Copper sulphate. Lead acetate. Lead nitrate. Magnesium silicofluorid. Mercuric chlorid. Mercuric chlorid and hydro- chloric acid, 1 per cent. Potassium chlorate. Sodium fluorid. Sodium bifluorid. Zinc silicofluorid. Creosote in kerosene. Formalin. Lysol. Mykantin. Orthonitrophenol. Rongalite. Red-oak blocks f by f by 1^ inches long, sawed from the sapwood of summer-cut logs, were used in each case. Ten blocks constituted a group. The individual blocks of a group were immersed for ap- proximately 10 seconds in one of the respective solutions, drained, and then sprayed on all six sides with a water suspension of the spores taken from the same cultures as those used in the steaming experiments.^* The sprayed blocks of each
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