Many researchers find VM parallels in analysis of old manuscripts. I believe the zodiacal maps in the VM have closely fashioned similar maps and charts in other readable books or manuscripts. It makes me think that if some researcher found a chart of which the VM is similar, could that be how we establish a key to break the VM code?
Assuming No matter what the squiggle in Voinichese is, if the number of letter positions matches the numbe of letters in Gemeni, Tauris, etc, then we have the start of a deciphering.
Part of my thinking is that the VM is a derivative document that copied work that has been produced before by others. The scribe took the easy route and copied over the chart and the language, but encrypted it. For me, the only value of the encryption would be to protect any alchemical recipes. Of course, making potions from non existant plants is tricky

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@GlennM
You are still new here and have outdated views.
You always write about non-existent plants.
Perhaps he/she was not a gifted draughtsman, but the plants are authentic.
For example “Gundermann”. flocked flowers, round toothed leaves. Root individual, sense of the beholder. You almost can't draw it any better.
Classic medicinal plant.
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Aga, you are so very right, I thank you for bringing this plant to my attention.Its distribution is quite broad. Too, since the plant was widely known and used, there is not much reason to encrypt the language, since anyone familiar with the plant would also know its uses. Yet, if it were blended with other ingredients and consumed as a pill, beverage or made into a salve, that might well justify keeping the recipe secret. Thanks for your help, teacher.
Bluetoes 101. Thank you for the video link. So substitution ciphers won't do. From what I understand, the language could be made up, or keyed to some other text. Neither promises a solution. In fact, most of what I've learned is what the manuscript is not. There are very smart people on this forum. I am in awe.
Hi Glenn, I do apologise I must have cut my comment with the link by accident
But yes, essentially a substitution cipher is out the window. So far, I think it is fair to say the manuscript text is not a typical case of anything we see from the time. Understanding the character entropy studies conducted on the text I think is an essential step if you wish to further your knowledge on the manuscript text.
My personal opinion is that the text has too many observable rules to be made up/gibberish, but others would entirely disagree.
Quote:But yes, essentially a substitution cipher is out the window
But lot of people even today are stubbornly trying to read it this way.
If you don't follow that path, you will be already on the next level

I'm no botanist, perhaps you are. Perhaps you have seen this.
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The list may need an update. Aga's got a good one
Several people have gone through the VMs illustrations and found matches for most all, despite, I agree, they look like Frankenplantz. I'm still confused by all the examples of leaves with nebuly edges.
Identification of the plant in the illustration is only the first step. Finding the same plant in a relevant medieval source is the second step. Theory has it, if the plants are the same then the written texts may be similar. Sounds good, but AFAIK, it hasn't happened, obviously not a successful comparison.