42 



The Weekly Florists' Review* 



June 24, 1009. 



Pa. The lecturer briefly sketched the 

 scientific. side of the Lumiere autochrome 

 system of color photography, and re- 

 ferred to previous processes attempted. 

 After stating some of the laws of light 

 as applied to our perception of colors 

 and the fact that white light is made up 

 of three primaries, red, green and blue, 

 he said that the Lumiere process orig- 

 inated in France after many years' ex- 

 perimentation— The autochrome plate is 

 composed of a layer of transparent 

 starch dots so fine as to be present on 

 each plate to the number of some five 

 millioiis to the square inch. These trans- 

 parent dots have been colored in the 

 three primaries and are intermixed. 

 When deposited on the plate they give 

 to it, viewed at a distance, a light gray 

 appearance, and at a sufficient distance, 

 white. Viewed closely through a micro- 

 scope, each dot appears separately. This 

 dot is the essential part of the Lumiere 

 invention. It is covered by the ordinary 

 photographic emulsion, and in the process 

 of color photography the plate is placed 

 in the camera in reverse fashion, so that 

 all the light which reaches the sensitive 

 surface must first pass through the layer 

 of colored starch grains or dots. When 

 exposure is made, all the light reflected 

 from the petals, say, of a red rose, passes 

 only through the red starch grains except 

 sufficient of the blue and green to modify 

 the red to the exact shade of the rose. 

 The rest stops right at the starch grain 

 layer and is absorbed. In the same way 

 the green leaves reflect light which passes 

 through the grain dots modified by the 

 other colors. Thus each color reflects its 

 own intensity of light action onto the 

 sensitive photographic surface lying back 

 of these marvelous starch grains. When 

 developed by ordinary photographic 

 means the chemical action places over 

 each of these little dots which has been 

 acted on, an appropriate amount of me- 

 tallic silver. Immediately a wide de- 

 parture is taken from the familiar pho- 

 tographic methods by subjecting the plate 

 to chemical action which dissolves away 

 every scrap of this silver which has been 

 acted upon, thus uncovering the trans- 

 parent starch grains which have been 

 opposite any particular color reflection, 

 and the ren^ainder of the grains are left 

 covered, so that when the plate is com- 

 pleted only the red dots opposite the red 

 rose petals are uncovered and all others 

 axe wholly or partially veiled by de- 

 posited metallic silver. 



The lecturer explained how when this 

 plate is viewed closely by microscopic 

 means it is seen that the brightest red 

 contains green and blue and the brightest 

 blue contains red and green, the aston- 

 ishing fact being presented that there is 

 no absolutely pure color in nature. 



By far the most interesting part of the 

 lecture to those not concerned in the 

 technical aspects was the presentation of 

 fifty or sixty examples of the aut6- 

 chrome, which were shown by a spe- 

 cially arranged stereopticon illuminated 

 by a powerful electric light. The most 

 delicate graduations of color in flowers, 

 plants, trees and manufactured objects 

 were noted. An extraordinary series of 

 pictures of Niagara Falls showed the 

 sheen and tint of the water apparently 

 almost in motion. The commercial ap- 

 plication of the process was illustrated by 

 autochrome reproductions of work done 

 from autochromes. Catalogue covers and 

 the like were thrown on the screens in 

 the exact colors in which the original ap- 

 pears, togetner with a separate showing 

 of the printing process which intervened. 



LEONARD SEED C2: 



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BEANS, PEAS, SWEET CORN, ONION, GARDEN SEEDS 



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 FLOWKR SUDS 



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THE EVERBH B. CLARK SEED CO. 



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lOlford, Conn* 

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 SUt«r Bay* Wis* 



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■■^__^^_4,^^^ ■ ■ Long Island Cabbage Seed, Cauli- 



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NEW YORK Price Ustt Free Quality Finest Whelciale md Retii 



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SWEET PEA and NASTURTIUM 

 SPECIALISTS 



Wholesale growers ol full lists of FLOWER 

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TTie lecture was an interesting presenta- 

 tion of a novel and important process 

 new to most of the audience. 



Those Present. 



In the absence of any formal registra- 

 tion, the following were noted as among 

 those present: 



.\ffeld, W. C. of the Albert Dickinson Co., 

 Minneapolis, Minn. 



Allen, Linnsens, Floral Parlj, N. Y. 

 Arclilas, L. H., of Archlas Seed Store, Seda- 

 lla, Mo. 



Bailey. Prof L. H., of Cornell University, 

 Itliaca. N. Y. 



Barret, T. A., of the American Agriculturist, 

 New York, N. Y. 



Barrett, W. H., Adrian, Mich. 



Barteldes. F. T., of the Barteldes Seed Co., 

 Lawrence, Kan. 



Bertoli. H. A., of Bromfield & Colvln, Bay 

 City, Mich. 



Bolglano, F. W., of F. W. Bolglano & Co., 

 Washington, D. C. 



8.M.ISBELL&CO. 



JACKSON, mCH. 



Contract Seed Growers 



BEAN, CUCUMBER. TOMATO 



Radish, Pea, Muskmelon 

 Squash, Watermelon, Sweet Cora 



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 ^^W for Immediate Slilpment 



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Waldo Rohnert 



GILROT, CAL. 



Wholesale Seed Grower 



Specialties: Lettuce. Onion, Sweet Peas, Aster, 

 Cosmos, Mignonette, Verbena, in variety. 



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