Surely the Qur’anic ‘Alaqah (the leech-like stage) is easily observed with the naked eye?.

‘Alaqah is a stage in the development of the human embryo. One of the meanings of the term ‘alaqah is a leech. If you examine the illustrations above, you clearly see that the shape of the embryo does in fact resemble a leech.

‘Alaqah refers to the embryo when it is extremely small. Due to the small sizes involved scientists could not have recognised the detailed features of the‘alaqah stage [1]:

It is remarkable how much the embryo of 23-24 days resembles a leech. As there were no microscopes or lenses available in the 7th century, doctors would not have known that the human embryo had this leech-like appearance. In the early part of the fourth week, the embryo is just visible to the unaided eye because it is smaller than a kernel of wheat.

Prior to the advent of the compound microscope, there existed no means to observe the early stages of human development. Even after the invention of the microscope, several scientists around 1720 claimed to have observed under the microscope extremely minute forms of men complete with arms, heads and legs within human spermatozoa. Another scientist insisted that he had seen a minute horse in the semen of a horse, a similar creature but with very long ears in the semen of a donkey, and tiny cockerels in the semen of a cock! Inadequate observation or faulty experiment led to many false theories.[2]

So, when would the human embryo then be visible to the unaided eye? Prof. Keith L. Moore, who has studied many early embryos, says [3]:

I guess it depends on how good your eyes are. But if you have normal eyesight you should be able to see it around 22-23 days when it’s just about the size of a kernel of what. But without a magnifying glass or without some microscope you wouldn’t be able to see the details that we’ve shown you.

As Dr. Persaud said, when they were talking about the ‘alaqah leech-like substance certainly they were not able to see that embryo – even if they opened the uterus to look at it – it would be so small. And I’ve seen them, it’s just a little white spot. It’s only when you put a magnifying glass to it that you can actually see these details that make it look like a leech.

So they certainly didn’t have that knowledge and I would say you can’t see it up until after three weeks.

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