john_hewitson at breathe.co.uk
Sat Mar 18 13:15:15 EST 2000
N. Harrison wrote on 16/3/00 6:11 pm
>> In my teaching laboratory I have a leaf with an iodine / starch positive
>>from an old b/w negative which I mounted between plastic (OHP) sheets and
>>sealed the edges with sellotape. It has survived for years and I keep it
>>in reserve to pass round as "Here's one I prepared earlier."
>>> Maybe it's the boiling in alcohol that helps them keep - you
>>>might not have wanted to do this in a 4th grade class! - NH
>>My leaf is also a geranium leaf and I DID boil it in alcohol first - so I
>>guess Nancy could be right.
>>Dr. John Hewitson (Oundle School)
>>Bramston Garden Cottage, Oundle, Peterborough PE8 4BG UK
>>Phone and Fax +44 (0) 1832 272209
>>email john_hewitson at breathe.co.uk
>John, that idea about mounting between plastic sheets is great!
>We often have to "share" leaves between the majors and
>non-majors classes, when they are all doing PSN at the
>same time (we have only one geranium plant, usually.)
>But could you tell me what "OHP" plastic is?
OverHead Projector plastic (you know ... that plastic stuff you write on
with felt-tip pens, or photocopy onto and project over your head on the
wall behind you for the class to see) - but nothing fancy about the
plastic - any stiffish plastic you have would do the trick.
Dr. John Hewitson (Oundle School)
Bramston Garden Cottage, Oundle, Peterborough PE8 4BG UK
Phone and Fax +44 (0) 1832 272209
email john_hewitson at breathe.co.uk
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