68 



Popular Science Monthly 



Portion of a motion picture taken through periscopes at the 

 bottom of the sea in the crystal-clear West Indian waters 



Seeing the Wonders of the Ocean 

 Through an Inverted Periscope 



AS is well known, the periscope enables 

 ±\ the submarine, while submerged, to 

 see above the surface of the water. Why 

 not invert the periscope, attach it to the 

 side of ocean liners, and thus enable the 

 passengers to study marine growths and 

 fishes ? Provided there was sufficient light 

 beneath the water, the inverted periscope 

 might even be used to search for sunken 

 treasure ! 



This is exactly the use to which it is put 

 in the latest underwater motion picture film 

 of the Williamson Brothers, "The Sub- 

 marine Eye." It will be recalled 

 that the thrilling underwater 

 scenes in "Twenty Thousand 

 Leagues Under the Sea," 

 were photographed by the 

 Williamsons. In "The 

 Submarine Eye," the new 

 under-sea thriller, the invert- 

 ed periscope, as shown in the 

 illustration above, is used to lo 

 cate a safe containing treasure. In 

 the crystal-clear waters of the West Indies 

 the audience is shown the marvels of 

 Nature at the bottom of the sea where the 

 light from above is reflected from the 

 dazzlingly white sand. Finally, after a 

 series of harrowing adventures many 

 fathoms under water, the safe is located 

 by the inverted periscope. 



Importing Japanese Mos- 

 quitoes for Bird Food 



THE delicate vocal organs 

 of song birds respond 

 magically to special care be- 

 stowed upon the diet. For 

 this reason birds that are 

 cultivated in captivity are fed 

 specially prepared foods de- 

 signed to furnish maximum 

 nourishment with minimum 

 labor of the digestive organs. 

 A food which has been 

 found especially valuable to 

 bird-breeders has for its prin- 

 cipal ingredients Japanese 

 mosquitoes and ants' eggs. 

 It is prepared by George 

 Jenkins, of New York city, 

 an expert on the care and 

 feeding of birds. The na- 

 tionality of the mosquitoes is 

 not supposed to make a dif- 

 ference in the taste or digest- 

 ibility of the food. The reason the insects 

 are imported from Japan is that the Japan- 

 ese have a method of catching them in 

 large quantities which as yet Americans 

 have not discovered. 



In the photograph below, Mr. Jenkins 

 is shown inspecting a shipment of twenty- 

 eight pounds of mosquitoes. The food is 

 intended for soft-billed birds that do not 

 feed on seeds. Among these are the 

 thrushes, mocking birds, nightingales, tan- 

 agers and many others. In the oval photo- 

 graph an American thrush is shown feeding 

 her nestling with the prepared food. She 

 takes the food on 

 her bill and thrusts 

 it far down the 

 youngster's 

 throat. 



Twenty-eight pounds of Japanese mosquitoes 

 to be used as an ingredient in the bird-food 



