In water, oxamide was sparingly soluble and released ammonia slowly at 25" C. In an uncropped soil, conversion of the nitrogen in oxamide to ammonia and nitrate was essentially complete in 1 week with -60-mesh oxamide, but much slower with -4 + 6-mesh oxamide. Nitrogen uptake by one crop of corn forage in greenhouse pots from -4 + 6-and -2 8 + 35-mesh oxamide was approximately 22 and 89y0, respectively, of uptake from ammonium nitrate or 60-mesh oxamide. Nitrogen recoveries by three successive corn crops from 800 mg. of nitrogen applied as oxamide ranged from 44 to 64% on unlimed Hartsells fine sandy loam (pH 5.2) and from 61 to 82% on this soil limed to pH 7.5. These recoveries were similar to those from ammonium nitrate and considerably higher than those from an equal application of nitrogen as urea-formaldehyde.

Yields and uptake of N by corn forage grown in pot experiments with N fertilizers mixed with and surface‐applied to moist soils a week prior to planting were determined. Losses of N were low with mixed placement. High losses of N, presumably as NH3, occurred from granular urea surface‐applied to Hartsells fine sandy loam limed to pH 6.2 and 7.5 and to Webster silty clay loam (pH 8.2). Losses were reduced by coating urea with S or by including phosphate in the granules as urea ammonium phosphate. Severe losses of N also occurred with surfaceapplied ammonium sulfate and diammonium phosphate, especially from the naturally calcareous Webster soil. Maximum recoveries from soils of pH 6.2 to 8.2 were obtained from monoammonium phosphate, ammonium nitrate, ammonium phosphate nitrate, and ammonium polyphosphate. Differences in losses of N as NH3 among N fertilizers can be explained largely in terms of urea hydrolysis or the reaction of certain acid radicals of ammonium salts with calcium compounds in soil.

T he spectral absorption of th in fi lms of cellulose a ce tate, regenerated cellulose, t he a ce tate and regenerated cellulose after oxid ation with nitrogen d ioxide gas, a nd t he regenerated cell ulose after oxida tion w it h periodic acid foll owed by chlor ous aci d, a re recorded fo r the infra red from 2 to 15 mi Cl'O ns and the ultraviolet from 215 to 400 millimicrons. T he rege nerated cellulose absor bed ul t raviolet radia nt e n e rg~' only a t t he short wavelengt h end of t he region studied , and t he re the t ra nsmi ttan ce of a fi lm 2.8 micon s thick was onl y sli gh tly red uced. The aceta te and oxidized cell uloses abso rbed in this region t o a g reater exten t but gave no narro w absorpti on ban d. ~1a rk e rl changes we re obse rved in so me of t he absorpt io n bands in th e infra red region in going fro m cellulose acetate to rege nerated cellul ose an d t o t heir oxidation products. These changes we re co rrelate d wi th changes in t he OR. CO,' and COOH g roups. T he r ul ts indi ca te t he possibilit. '• of es ti mating t he a mount of th ese group s pre;;en t by spect ra l a bso rption m ea sil re ments.

Greenhouse and laboratory studies were conducted to measure the factors controlling release of N from sulfurcoated urea (SCU). Results of two greenhouse pot experiments with common bermudagrass (Cynodon dactylon) and a third with uncropped soil in controlled environment regimes showed that the rate of dissolution of SCU increased greatly with higher temperatures of cropping or incubation. Dissolution rates of SCU granules were decreased by heavier coating with S, by inclusion of 0.5% coal tar oil microbicide in the coating, and by surface application, as compared to mixing with the soil. Satisfactorily coated urea (SCU) or split applications of uncoated ammonium nitrate (AN) or urea both resulted in more uniform distribution of forage production and N uptake than did a single application of urea or AN at time of seeding. Greater yields of forage were obtained from single applications of some SCU products than from urea or AN. Apparent volatilization losses of surface‐applied urea were severe, particularly at higher growth or incubation temepratures. Losses of N were reduced, but not entirely eliminated by S‐coating.

Brunauer-Emmett-Teller (BET) surface areas of hydrated portland cement have been calculated from water-vapor and nitrogen-adsorption data. The adsorption and desorption of wat~r vapor caused. measurable decreases in specific surface areas by both water-vapor and mtrogen adsorptIOn. Changes were !tlso produced by wetting and drying. The adsorption and desorption of nitrogen at the boiling point of liquid nitrogen did not produce similar effects.The specific surface and nonevaporable-water content of a hydrated cement are also somewhat dependent on the initial drying treat ment. The effect of measuring water-vapor surface a nd nonevaporable water with specimens dried for different periods of time is also considered.