Microphotography showing blood corpuscles of humans, fish and frog.
Subtitle to main title is: "The true nature of things in common."
Story about human blood. C/U of blood corpuscles under a microscope. We then see some corpuscles inside the eye of a needle - to show how tiny they are. C/U of a man wrapping a piece of bandage around his finger then making a pinprick in the tip of his finger. He then places a spot of blood on to a piece of glass. We then see the blood under the microscope.
Intertitle reads: "Circulation begins in fish eggs before they are hatched." C/U of fish eggs being poked around with tweezers. "Blood vessels in baby trout absorb the oil drops which supply them with food." C/U of a glass of water - a drop of oil is placed into the water. C/U of the baby trout. We then see the veins of the fish absorbing the oil. C/U of the heart of the fish beating. C/U of blood moving through the veins. C/U of a slightly older trout.
"The circulation of a frog may be observed through his foot." Microscope shot of some sort of molecules. Microscope shot of blood in human veins.
Was an item in Pathe Pictorial issue number 625.
Safety print only.