Science-gossip . utiful com-plexions. If these are really due to the use ofthe papaw, it will probably be found that thedigestive action of the juice plays a part in theprocess. In tropical countries meat has to beeaten at so early a period after slaughter as to bevery tough and flavourless, and it is therefore acommon practice to rub it with a slice of the fruitand thus render it more tender and ferment or enzyme which is the active agentin this preliminary digestion is known as papayo-tin. It has been separated from the juice of theplant in the form of a white powder, which, h
Science-gossip . utiful com-plexions. If these are really due to the use ofthe papaw, it will probably be found that thedigestive action of the juice plays a part in theprocess. In tropical countries meat has to beeaten at so early a period after slaughter as to bevery tough and flavourless, and it is therefore acommon practice to rub it with a slice of the fruitand thus render it more tender and ferment or enzyme which is the active agentin this preliminary digestion is known as papayo-tin. It has been separated from the juice of theplant in the form of a white powder, which, how-ever, has not yet bee:i obtained in a pure many respects it resembles the pepsin isolatedfrom the stomachs of animals, though it differsfrom it in being rendered inactive by acid of thestrength of that in the gastric juice. In commercethe juice of the papaw is used in the manufac-ture of various peptonised food products, such asCibils Fluid Extract of Beef and Antweilers Peptone. SCIENCE- G OSSIP. 117. CONDUCTED BY B. FOULKES-WINKS, EXPOSUKE TABLE FOR SEPTEMBER. The figures in the following table are worked out for plates ofabout 100 Hurter & Driflaeld. For plates of lower speed numbergive more exposure in proportion. Thus plates of 50 H. & require just double the exposure. In the same waj,plates of a higher speed number will require proportionatelyless exposure. Time, 10 to 2 Between 8 and 10 and 2 and 4 double the required exposure. Between 7 and 8 and 4 and 5 multiply by 4. Subject F. 5-6 F. 32 JL i Sea and Too T50 Tio io i^ i Open Landscapeand Shipping M. j_ h ^ i i I 1 Landscape, withdark fore-ground, StreetScenes, andGroups JL. i I i 1 2 4 Portraits inKooms V 4 8 16 32 - - - Light Interiors 4 : 8 16 32 1 2 4 8 Dark Interiors 16 , 32 1 2 4 8 16 30 The small figures represent seconds, large figures exposures are calculated for sunshine. If the weather iscloudy, increase
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