EXPERIMENTS 43 
Do all the leaves on the plant respond when only one is 
touched? Try to learn if all parts of a leaf are equally 
sensitive, by touching different parts very lightly with a 
small splinter. Cover a plant whose leaves are in their 
normal position very carefully, so as to shut out all light. 
After the plant has been in the dark half an hour note 
the position of the leaflets and leaves, and again half an 
hour later. 
Literature, 
POMC T VE lANE, PRETATION S i oe Sie lice ec bidie's so ei a\ele w aleed eraaebs 6-27 
eoaumlter: Text Book: in Bolany oie ek oe cee cae e ene 5-15 
Avebury: Flowers, Fruits and Leaves................005. 97-147 
Geddes: Chapters in Modern Botany.............csce000% 60-94 
Darwin: Power of Movement in Plants......... 280-297, 394-417 
Bergen and Davis: Principles of Botany................. 80-101 
Bergen: Foundations of Botany..............c.cceeees 1. 119-149 
Photosynthesis, 
Exp. 29, Groups of Two: With a sharp knife cut 
two slices about I cm. thick, from a cork 1.5 cm. in 
diameter; put the smooth surface of one of the corks 
against the upper surface of a healthy green Nasturtium 
or cheese-weed (Malva) leaf and that of the other piece 
directly opposite against the lower surface of the leaf; 
stick two pins thru the corks so as to hold them closely 
against the leaf. Now select a second green leaf on the 
same plant and without injuring it in any way put the 
blade into a wide mouthed bottle containing 1 c. c. of 
75 per cent. potassium hydrate (KOH), which the in- 
structor will give you. Be very careful not to get this 
to the leaf. It is used to absorb the carbon dioxid in 
