40 Mr. D. Thoday. Experimental Researches on [June 1 1 , 



Accordingly the results for each kind of letif will be considered separately. Tiiey are 

 briefly set forth below. 



Two templets were employed, measuring respectively 8 cm. by 5 cm., and 4 cm. by 

 5 cm. When accurately measured, their areas were found to be 40'2 sq. cm. and 

 20'1 sq. cm. 



Bticklatidia, populnea : leaves smooth and leathery, with prominent principal veins. 



(a) Templet, 40'2 sq. cm. 



40"1 sq. cm. "1 Rectangles cut from the same leaf and printed together in the 

 40'0 ,, J same frame. 

 *39'9 sq. cm. 1 Rectangles cut from the same leaf and printed together in the 

 39 '8 „ J same frame. 



Maximum difference from the average ±015 sq. cm., i.e. ±04 per cent. 



(b) Templet, 20-1 sq. cm. 



20-0 sq. cm.|p^.^^^^^ t,^^^. 

 19-9 „ / ° 



19-9 „ } 



20"0 sq. cm. 

 19-9 „ 



Maximum difference from the average ±0'05 sq. cm., i.e. ±0'3 per cent. 



Omalanihus Leschenaultiamis : leaves softer than those of Bueklandia, but smooth and 

 fairly firm, with prominent principal veins. 



Templet, 40"2 sq. cm. 



40-1 sq. cm.| j^^^. 

 40-1 „ / 



Difference, nil. 



Ranuncuhis sp. .• leaves large, with soft irregular lamina between a prominent network 

 of veins ; specially selected as unsuitable for use with templets. The pieces were cut and 

 printed separately. 



Templet, 40"2 sq. cm. 



40'2 sq. cm. 

 40-1 „ 

 40-0 „ 



Maxiiimni difference from the average ±0'1 scj. cm., i.e. ±0'3 pei' cent. 



Tniiplet, 20-1 sij. cm. 



19"9 sq. cm. 

 19-9 „ 

 Difference, nil. 



Ilelianthus annuus : leaves large, fairly thin, with minor veins somewhat outstanding, 

 but otherwise lamina fairly flat. Printed in the summei' ; this fact and the rapid 

 shrinkage of the leaf account for the low average area of the prints. 



* This was a younger loaf than the first, and it is ([uite conceivable that it should be 

 considered 8ej)arately, on the same grounds as with leaves of different species. If so, the 

 maxiniuin diffei'ence is under +0'2 per cent. 



