By means of paired feeding tests, it has been shown that sesamemeal is deficient in cystine and that cottonseedmeal is not deficient in this amino acid. Bran and coprameal are apparently not deficient in lysine, while the supplementation of peanutmeal with methionine did not enhance its growth-promoting properties. Tryptophane does not appear to be a secondary amino acid deficiency in either soyabeans or linseed meal. By means of nitrogen balance studies, it was shown that the increased weights obtained by the supplementation of sesamemeal with cystine are due to a better utilization of the sesamemeal nitrogen. The unsupplemented biological value previously determined by Smuts and Malan was 71 and the supplemented biological value as determined in this paper 80. In the case of cottonseed supplemented by cystine, the biological value of 84 is only slightly higher than 81, and does not signify a significantly better utilization of nitrogen of the supplemented over the unsupplemented cottonseedmeal.

Cystine is determined as cysteine in hydrolysates of plant or biological material of low cystine content. This method is an improvement and also more accurate than the previous one described.

A recessive virescent mutation (v) appeared in an F4 Kameji X Blue Rose progeny row. In the F2 generation of a cross No. 2912A21 (virescent) XC. I. 4630 (normal), virescence was found to be linked with three other recessive factors in the following order: Glutinous-colorless apiculus-virescent-noncluster. A maturity factor was apparently closely linked with virescent, but the relative position was not determined.

1. The specific gravity of 54 samples of South African Merino wool from various wool-growing areas was determined. Significant differences occurred among these samples. 2. The mean value was 1.3052 at 25°C., water at 4°C. with a standard deviation of ±0.0035 and a coefficient of variability of ± 0.27 per cent. 3. A series of samples presumed to have been selected for differences in specific gravity were analysed. The results were inconclusive. 4. No correlation between the specific gravity and the fibre fineness of the samples was obtained. 5. The influence of variations in specific gravity on the determination of fibre fineness by the weight-length method is discussed.

The quality and the quantity of the microflora in the soil of the plats and in the run-off from these soils were determined. The counts of the organisms of the various physiological groups were expressed as numbers in each gram of solids. By averaging the data, all determinations show that the total number in the run-off exceeded that in the original soil about 200 times. The number of ammonia and sulfur oxidizers, of Rhizobium trifolii, and of anaerobes that were found in the soil or in the run-off from the soil constituted a small fraction of the total population. Under the conditions of these tests fertilizers did not affect the number of organisms in the sample of the original soil or in the run-off obtained from the soil.

Data presented here indicate the possibility of reducing injury caused by Aphis maidis through the use of host resistance. The corn-leaf aphid is an especially serious problem in the production of certain foundation seed stocks which are for use in the production of commercial hybrid seed corn. The infestation was determined by an examination of recently emerged tassels for the presence of aphids. Although the severity of the infestations was measured by classifying all infested plants in one of three infestation classes, in general the total percentage of infestation was considered as a reliable indicator of relative resistance or susceptibility. Data are presented from many yellow and white inbred lines as well as from a sufficient number of single crosses to indicate that resistance to this insect is a heritable character.

The supplementary effect of methionine on lucerne, lysine on oats seed, cystine and methionine on peanutmeal, cystine on linseedmeal as well as the supplementary relationship between yellow maize and lucerne and of yellow maize and soyabeans have been determined by means of their biological values. From the results obtained it is concluded: 1. That 0.2 per cent. dl-methionine increased the nitrogen utilization of the lucerne proteins by 30±1.64 per cent. 2. Cystine has no supplementary effect on peanutmeal, while methionine improves the protein to a slight extent. 3. Cystine supplementation increases the nitrogen utilization of linseedmeal by 8±2.04 per cent. 4. Lysine supplementation has no significant effect on the proteins of whole oats seed. 5. The proteins of whole yellow maize and lucerne and of whole maize and soyabeans supplement each other in a marked and significant manner.

Fertilizer analyses tests are usually conducted on the basis of a given number of pounds per acre of the different analysis fertilizers. Where the percentages of nitrogen, phosphoric acid, and potash vary, there is in reality a rates test of all three elements. Where rates vary, the operation of the law of diminishing returns may prevent the interpreter from arriving at the analysis from which the farmer will obtain the most profit for the money invested in fertilizers. A method was presented for calculating the analysis from which a farmer would obtain the most profit for a definite amount of money invested in fertilizers. The method of eliminating differences in investment is based upon the data obtained from a rates of one analysis test which is conducted with the analysis test. The data are plotted and a curve of best fit is drawn. From the curve, the increase in yield from fertilizer equal in cost to the analysis fertilizer being compared with the plotted analysis fertilizer is obtained. With equal costs the best fertilizer may be determined and the calculations made for any convenient investment in fertilizer.

Results obtained during a study of the sizing of continuous filament bright viscose rayon warps indicated that: (1) Greater uniformity in the regain of sized warps was made possible by means of automatic control of the steam pressure in the dry cans in place of the usual manual control. (2) A pressure of 7 lbs, to 9 lbs. on six dry cans was szuffi cient to dry a warp of the type used in these experiments to a regain of 10% at a speed of 40 yards per minute. (3) The pressure required was determined partly by the amount of moisture left in the warp by the squeeze roll. The type and condition of the blanket on the roll was an important factor. (4) At pressures below 7 lbs. in the dry cans good control was not obtained due to the clogging of the condensate traps in the steam line. (5) Automatic control was most effective when there were fewest stops during slashing. Warps must be made curefully in order to prevent stops due to crossed ends, cylinder laps, etc., on the slasher.

The moisture contents of ten kinds of textile fibres in the form of specially prepared yarns were determined when the fibres were in equilibrium with air for a series of relative humidities and tem peratures. Data were obtained for both "desorption." and "ad sorption," the yarns being brought to equilibrium from a wet condition and a dry condition, respectively. The fibres studied were raw cotton, "purified" cotton, mercerized cotton, clothing wool, carpet wool, viscose rayon, cuprammonium rayon, raw silk, degummed silk and cellulose acetate. The temperatures ranged from 96° F. to 302° F. and the relative humidities ranged from 5% to 90% for temperatures below 212° F. and up to the maximum obtainable at atmospheric pressure above 212° F. The results are given in the form of graphs showing moisture content against relative humidity and also in the form of graphs in which the logarithms of the moisture contents at given relative humidities are plotted against the reciprocals of the corresponding absolute temperatures. The last show straight line relationships with changes in the slopes of the lines between 200° F. and 220° F.