Carrotting conditions of the Angora rabbit guard hairs were studied by tracing the change in mechanical properties. The carrotting agents contained 1.8% of Hg(NO₃)₂ and 3.6% HNO₃. The immersion was carried out at 20, 30, 45 and 60°C. The drying of the hairs after immersion was made for 2 days at room temperature or for 5, 15, 30, 60 and 120 mins. at 95°C respectively.
As the results, it was observed that the mechanical properties of the hairs were modified remarkably by raising the immersion temperature but the effects of the drying temperature and time were negligibly small.

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Angora rabbit fibres were immersed in the solutions containing various amounts of Hg(NO₃)₂ and HNO₃ for various length of times at 30°C and dried for 30min. at 95°C. The mechanical properties of the treated fibres were tested, and the following results were obtained:
1. The effects of the immersing time (5_??_65mins) upon the 30%-extension and the recovery work are significant at 1% level and that upon the resilience is also significant at 5% level.
2. The effect of the concentration of Hg(NO₃)₂ (0.5_??_3.5%) upon the extension and the recovery work are significant at 5% level.
3. The concentration of HNO₃ (1.5_??_4.5%) does not affect significantly all of the above parameters at 5% level.
Then another series of experiments was carried out in which the composition of the carrotting liquor was kept constant (0.5% Hg(NO₃)₂ and 1.0% HNO₃) and the time and temperature of immersion were changed. As the result, it was observed that the 30%-extension and the recovery work decreased to 60_??_73% and 56_??_72% of the original amounts of the corresponding works by immersing for 2hrs. at 60°C respectively.

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Dye-asorptions with acid, basic, dispers colors were determined for pure P. A. N. fiber and AAm copolymer fibers and the following results were obtained.
1) Paticularly, dyeability to basic dyes is increased by copolymerization of AAm (CH₂=CH•CONH²).
2) -NH₂, -NHR radicals of dye molecule increase the dye absorption.
3) AAm-copolymer fiber treated with HCl shows the excellent dyeability to acid dyes, but is inferior to the other dyed fibers in wash resistance.

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Seven unbleached sulfite pulps with different _??_ (1, 840-1, 070) were prepared from red pine (pinus densiflora), changing duration of hours at max. temp (140°C). These pulps were all purified in three stages, namely: chlorination, hot alkaline purification, and hypochlorite bleaching. The processing conditions to prepare the bleached pulp with same α-cellulose content and also same DP from each unbleached pulp, were investigated. The results were as follows:
1. The carboxyl content in unbleached sulfite pulp has decreased in proportion to the decrease in its _??_, but the copper No. remained about same irrespective of its _??_, varying within 1, 070-1, 840 _??_.
2. In hot alkaline purification, the decrease in pulp yield was about 2.5 time of the amount of the consumption of NaOH upon unbleached pulp, and the decrease in pulp yield due to increasing one present of α-cellulose content was approximately three percents upon the unbleached pulp. These results were very similar to that obtained by Meller, Leugering etc. in hot alkaline purification of beech and spruce. Also the direct proportionality of the decrease in copper No. to the decrease in pulp yield upon unbleached pulp was observed. The hot alkaline purified pulp with definite α-cellulose content, prepared from each unbleached pulp, has gradually lower copper No., 1% NaOH sol. and β-cellulose, and higher carboxyl content in increasing in _??_ of unbleached pulp.
3. In hypochlorite bleaching under higher pH like this experiment (initial pH=11.5 at 50°C), the copper No. and 1% NaOH sol. decreased and, on the other hand, carboxyl content increased in portion to the consumption of aval. Cl₂ upon hot refined pulp. The _??_ of each pulp dropped rapidly to about 600 with the consumption of aval. Cl₂ 0.8_??_1.2% upon pulp, and these figures correspond to 0.09_??_0.14 O₂ per one anhydro-glucose unit. However, with further consumption of aval. Cl₂, the rate of drop of _??_ decreased gradually.

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Polyvinylchloride fiber was decomposed by ultra-violet ray in vacuum system. From the results, the reaction rate, υ_p, is expressed as follows were, K is a constant, (P_a) is amorphous region content in sample fiber, and φ(I) is intensity of absorbed ray.
at the photodecomposition of the undrawn fiber, activation energy is about 14 kcal/mol, which agrees with the one obtained from thermal decomposition of same fiber.
The following relation between the liberated hydrogen chloride volume x, and time t, is obtained k and m are constants, a is initial polymer content.

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In the dyeing of the acetate silk by the dispersed acetate dyestuffs, effects of the acids on the dyeing properties, of the dyestuffs were examined.
The change of color and F-value (Kubelka-Munk equation) of the dyeings dyed in the bath acidified with the acetic or sulfuric acid having the concentration from 0.005g/100c.c. to 0.5g/100c.c. was measured by the spectrophotometer and the results are represented by the C. I. E. system.
Nine dyestuffs of azo or anthraquinone series were used and nine experiments containing the neutral dye bath for each dyestuff were tried.
It was found that generally the change of the dominant wavelength was small and the excitation purity increases in the CH₃COOH-acidic bath, but decreases in the H₂SO₄-acidic bath for the most dyestuffs.
The F-value in the Kubelka-Munk equation for all the dyestuffs examined increase in the acidic bath. As to H₂SO₄-acidic bath the F-value increased in low concentration of H₂SO₄, while decreases as the concentration of the H₂SO₄ increased.

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Active halogeno compound, i.e. picryl chloride, easily reactic with various free amines gave fast and level-color-dyeing for the several kind of fibres. Benzidine series showed excellent amines of the popular type and basic deys which have the free amino radical in their molecules, combining with picryl chloride, increased the light fastness.
Uniform tint of dye in the crystalline regions of vinylon and protection of spots or color removal from various fibres was made more satisfactory of reasonable selection of dyeing process.
Materials arranged in the order of dyeability of fibre concerned are as follows;
Vinyl chloride film>Acetate rayon>Vinylon and Cotton>Silk.
Dyeing mechanism of these fibres appears to be that of solid solution type.

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