even doctor wimend webrel who is amongst the professors of 'society of junes hiknes' says:
it has been proved through experiments that the parts of a human body remain in working order due to nourishing power. since this saying is based on scientific findings it is highly explicit and significant. apparently, the first person who conducted this test on the body and part of an animal was doctor jack lup who was one of the surgeons of rockfeller hospital in new york. the said doctor tested the way of birth of a frog from those eggs which were not inseminated and came to this conclusion that amongst the eggs some remain alive for a long period while some die very soon. this incident, induced doctor jack to conduct once again this test on a frog and consequently succeeded in keeping alive these parts too for a long time.
later doctor wern luis and his wife proved that it is possible to keep the parts of a bird's foetus in salt-water and allowing them to live. when some organic substance is added to it, the said parts tend to grow and multiply. successive tests have revealed that it is possible for the parts of any animal which is kept in salt-water to remain alive and grow provide d they are given food. however it is still not known whether those parts remain alive or not after turning old.
afterwards, doctor carell embarked on further tests and proved that these parts do not bring senility in an animal. rather the life-span of these parts is more than the normal life-span of the animal itself. the said doctor started his experiment in the year 1912 and on this path faced many problems until he and his assistants finally succeeded in proving the following points:
(1) the afore-said parts remain alive constantly provided they do not encounter certain occurances which destroys them like deficiency in food and entry of some of the microbes.
(2) these parts not only remain alive but grow and multiply just as they grow and multiply inside an animal's body.
(3) it is possible to know the measure of growth and increase of these parts and their relation with the nourishment given to them.
(4) time has no effect on them. that is to say, these parts do not turn old and weak through the passage of time. rather, the slight effect of senility is not produced for them. moreover, these parts grow and multiply in the current year in the same manner which they used to grow and multiply in the previous years. all these internal things reveal that these parts grow and remain alive if proper care and food is provided to them. therefore the main factor which causes death is inattentiveness and not senility.
so, what is the cause of man's death? why is it that man does not live for more than hundred years and rather lives normally for only seventy or eighty years??!
we may reply as such: an animal's body possesses numerous and diverse parts and these parts have strong connection with each other. not only this but the lives of some of them are dependent on the lives of others. thus, when due to some reason or another, some of these parts turn weak and die, the other parts too die. similarly it is the microbes which reduces man's age and restricts it to seventy or eighty years especially the number of human-beings who die during childhood. what has ultimately been concluded from tests and experiments is as such: the reason why man dies is not because he has completed seventy, eighty or hundred years but because the external factors enter some of his (internal) parts and kill and destroy them and since there exists a relation between these and other parts, the other parts too get destroyed.