eternal rivalry between butter and "oleo" is a source of some work. All
in all, the contacts of the chemist become very numerous and intimate in so far as the life of his community is concerned, and he can become a factor of ever-inneasing importance, if he so desires. However, certain pitfalls must be pointed out. The idea of service to the c'ommunity must be held paramount. If be be a teacher, in serving his community he is serving his institution, and herein lies the justification of such outside work. The idea of financial gain must be kept in the background as relatively unworthy. Also, the teaching chemist must not expend so much of his energy on this sort of thing that he neglects his students, who look to him for guidance in all matters of the mind and spirit. If he does, he is forgetting the purpose for which his institution was established, neutralizing his physical and mental effectiveness, and, last but not least, failing to gain the affection and respect of those committed to his care, thus losing the most precious reward that comes to the laborer in the field of education. Honest conscientious service to all will be the motivating force in the activities of all worthy followers of Liebig. Color Movies Coming into Vogue. Black and white motion pictures, now so popular, may soon be superseded almost completely by films taken and produced throughout in natural colors, judging by the activity of several producing companies. Slapstick comedies will doubtless continue t o appear in drab monochrome for some time, but in feature photography the large conservative Hollywood producers are now capitulating t o the demand for color. At least a part of several major screen dramas now in preparation will revel in chromatic glory. With the aid of super-illumination much in excess of the usual studio requirement, the photographer now takes two films of the same scene simultaneously through a single lens. One of these responds only to green light, and is finished as a green transparency. The second, recording only red, is finished in red. The two films, pasted back t o back in exact register, are ready for the exhibitor. There is no photographic deposit of metallic silver a s in the case of the ordinary black and white picture. Artists, accustomed t o a whole galaxy of pigments, can hardly believe that red and green alone can yield such a m r a c y and variety in shade. Sky tints; anything you wish in leaf, tree-trunk, or earth shades; every possible hair and flesh tint, and even the renal effects of warm black plush and golden satin are faithfully and beautifully recorded. Pure lemon yellow, cobalt blue, and the pure purple shades are not available, howevera t least not until some three-color process is perfected. Unfortunately, there are only two sides of a film, so that the third color deesn't know where to go. These shortcomings, nevertheless, are not noticed hy the cinema patron, who spends most of his time appraising the flesh tints anyway! The color film costs several times the figure for black and white. However, when even the cheapest comedies cost five dollars per second of theater exhibition time, or in other wards five dollars per foot of film, the added expense d w s not rate high when compared t o other costs. Unlike the hand-tinted films of previous years, the new films may be duplicated, in positive, indefinitely without continued repetition of the great initial cost.-Science Service
