In this paper we dealt with the fundamental problems concerning the heating-stage method of fluid inclusions. When we observe fluid inclusions on the ordinary type of heating-stage, it is often shown that the fluids of inclusions leak out below the filling temperature. The leakage may be attributed to the presence of latent cracks, the strength of enclosing crystal, the differences of forming conditions of each inclusion and the dynamic interactions of inclusions. Therefore it seems that these phenomena cannot be disregarded and should be prevented as for as possible in the heating-stage method.
To avoid these phenomena, “compressing-heating stage”, by which we were able to observe the fluid inclusions in thecondition of saturated water vapour pressure, was made as a trial. Even in the case of a brittle mineral such as anhydrite, which decrepitates and leaks out thefluids of inclusions at various temperatures below the filling temperature in process of heating, we were able to observe the fluid inclusions without the leakage and decrepitation before the filling with the above mentioned equipment.
In the case of the quartz crystals synthesized hydrothermally, the filling temperature coincides approximately with the probable temperature estimated from the growth conditions. It appears that the method of filling temperature analysis of quartz crystal is usefull as the geothermometer. From the view point of the growth conditions and the distribution of inclusions in the synthesized quartz, the dispersion of the measured filling temperatures may be caused by a dense or sparse distribution of inclusions in plane or space and gas pressures in inclusions.

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In the present study were made microscopic observation on the chip formations inrock near and beyond the point of cutting.
The bit was stopped cutting and taken off from the cutting plane carefully, then the cutting plane was cemented over the wide range by Canada Balsam. This agglutinated rock sample was sliced to thin slab in parallel with cutting direction, and polished to make the thin section for microscopic observation. The thin section was successfull for us to observe the mode of rock fracture occuring in a vertical section of the cutting plane by a microscope of low magnification. Main results of observation for samples of marble, tuff and sandstone are as follows.
1) There are two different forms of fracture observed. One is the faulting and the other is the extention fracture.
2) The faulting occurs always first at the boundary between the crushed zone and the unbrocken rock with a constant angle of about 45° to direction of travel.
3) The extention fracture is brought about secondly at an angle ofabout 25° along with the propagation of cracks from the vicinity of the crushedzone to the surface.
4) These two forms of failure occur alternatively at every cut except for extremely small cut of depth. The region of faulting does not extend in relation to the increasing depth of cut, so that if depth of cut become larger, the faulting plane should be produced intersecting with the plane of extention fracture which has been caused previously.

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The author has developed an air-kerosene thermodrill and reported previously. This thermodrill is quite efficient for the boring of hard granite, but requires oxygen gas when it is ignited and it is inconvenient for the use of thermodrill in the remote places. In starting a combustion chamber the oxygen gas and the kerosene are fed as a propellant, and after the ignition of the propellant and the combustion is established the oxygen gas is replaced by air gradually. The technique of this process requires the dexterity of valve controll of the feed system. The delay of replacement oxygen gas by air results in destroy of the combustion chamber.
The air-gasoline thermodrill removed these disadvantages. The new thermodrill does not require oxygen gas and the ignition is carried out quite easily by the spark plug ignition method. This paper describes the construction ofthe thermodrill burner and some results of the experiment-the temperature of theout side wall of the combustion chamber, the total pressure distributions of thejet stream and the removal rate of the channeling test on granite blocks.

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Work index based on the third theory of comminution, presented by F. C. Bond in 1952, has been widely accepted in industry. Bond's method to determine standard ball mill work index W_is was adopted in Japanese Industrial Standard in 1969. According to the method W_is kWh per metric ton is determined by the laboratory grindability test using the following equation:
W_is=44.5×1.1/P₁^0.23×Gbp^0.82×(10/√P-10/√F).(1) whereP₁ is the opening in microns of the sieve size tested, G_bp is the net grams of sieve undersize produced per mill revolution, Fis 80% passing size in micronsof the new feed, andPis 80% passing size in microns of the sieve undersize product.
Eq.(1) gives practically good results as far as minus 6 meshfeed samples with natural size distribution are concerned. To finer feed, however, eq.(1) may not be apllied. A grindability test which simulated a two-stage grinding indicated that eq.(1) gave an unreasonable value for minus 65 mesh feed (table 1). Applying the third theory to the grindability test, the auther derived a new equation which would be applicable to wide range of feed.
The grindability test is a model which simulates a closed circuit grinding with a circulating load of 250%. According to the third theory, W_is should be calculated from the following equation:
W_is=K/(10/√P-10/√F)×B_p(4)
where B_p is the grams of the sieve undersize product per mill revolution, and K is work input mWh per mill revolution to the test mill on the assumption that its grinding efficiency is equivalent to the standard commercial ball mill, which is an average overflow ball mill of 8 ft inside diameter grindig wet in closed circuit.
Grindability tests on typical minus 6 mesh feed samples informed the following relationship (fig. 1)
K=14+4×B_p×(10/√P-10/√F).(7)
From eqs.(4) and (7), the third theory equation to determine W_is obtained:
W_is=14/B_p(10/√P-10/√F)+4...(8)
It is demonstrated that eq.(8) is equivalent to Bond's equation (1) on standard minus 6 mesh feed (fig. 1), and gives a reasonable value for minus 65 mesh feed as well (table 2). Eq.(8) is considered to be applicable to wider range of feed than eq.(1).
Besides, eq.(8) is considered theoretically to reduce the influence of inaccuracy of sieving. In consequence, eq.(8) is expected to improve the accuracy of W_is determination.
Derivation of eq.(8) revealed that grinding efficiency of the standard commercial' ball mill would vary depending on grinding resistance of feed ores. It is suggestedthat the efficiency is considered to decrease as the grinding resistance decreases.

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After repetitions of 9 times of the suspension electrolysis the details of whichhave been described in the previous paper spherical (80-100mesh) and dendritic (100-150mesh), copper seed particles grew into final products of +24mesh and +16 mesh (1.5-1.7mm dia.), respectively.
Micro and electronmicroscopic photographs of cross sections of grown particles were presented. Chemical analysis of the final products revealed thequality of copper deposit is comparable with that of commercial copper.

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The chemical potentials of oxygen in the Fe-FeTiO₃-TiO₂ and the Fe-FeTiO₃-Fe₂TiO₄ systems were measured by means of the following galvanic cell using zirconia solid electrolyte in the temperature range 800-1, 300°C
Pt/Ni, NiO//O^2-//Fe, FeO/Pt
Pt/Ni, NiO//O^2-//Fe, TiO₂, FeTiO₃/Pt
Pt/Fe, FeO //O^2-//Fe, TiO₂, FeTiO₃ /Pt
Pt/Ni, NiO// O^2-//Fe, FeTiO₃, Fe₂ TiO₄/Pt
Pt/Fe, FeO//O^2-//Fe, FeTiO₃, Fe₂TiO₄ /Pt
From the e. m. f. data, the following standard free energy changes were obtained:
Fe+FeTio₃+1/2O₂=Fe₂TiO₄;ΔG°=-65805+16.22T (cal)
Fe+TiO₂+1/2O₂=FeTiO₃;ΔG°=-69364+16.84T (cal)

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