Gr. E. Briggs, F. Kidd, and C. West 



107 



but also environmental conditions such as light, temperature, water- 

 supply, etc. The dates of the first appearance of the flowers and of seed 

 formation are also given. The work appears to have been carried out 

 without any pre-conceived idea as to what the results would be, and the 

 results themselves have not as yet been worked out nor have they re- 

 ceived critical consideration although collected and published 40 years 

 ago. These results will be analysed in this and in the following chapter, 

 and certain interesting conclusions reached. We have constructed from 

 Kreusler's data the tables and figures presented in this paper. Figs. 2 

 and 3 show respectively the relative growth-rate curves for "Badischer 

 Friih" maize, the rates being calculated, as above described, on the 

 basis of weekly periods for the years 1875-1878 inclusive, and for five 

 different varieties of maize calculated on the same basis for the year 1875. 



Table I. — "Badischer Friih" Maize grown at Poppelsdorf in 1875. 



Total dry Increase in 



weight dry-weight 



Date of Growth of a single since last 

 harvest period plant harvest 



1875 Days 



11th May 



1st June 

 8th „ 

 15th „ 



23rd „ 

 30th „ 

 7th July 



13th „ 



21st „ 



27th „ 

 3rd Aug. 

 10th „ 

 17th „ 

 24th „ 

 31st „ 

 7th Sept. 



15th „ 



21 



7 

 7 



Gm. 

 0-206 



0-268 

 0-559 

 1-069 



2-448 



4-776 



11077 



55-934 

 72-875 

 76-619 

 84-332 

 89-621 

 100-380 

 130-478 



Gm. 



0-062 

 0-291 

 0-510 



1-379 



2-328 

 6-301 



23-619 12-542 



43-844 20-225 



12090 



16-941 



3-744 



7-713 



5-289 



10-759 



30098 



Weeldy .Ratio of 



percentage leaf-area 



increase in Leaf- to dry- 

 dry-weight area weight 

 since last Sq. era. Sq. cm. 

 harvest per plant per gm. 



158-139 27-661 



(30)* 



10 

 108 



91 



(129) 



113 



95 



132 



(113) 



132 



(85) 



74 

 (28) 



33 



30 

 5 



10 

 6 



12 



30 

 (21) 



18 



33-3 



97-8 



181-1 



405-1 

 889 

 1543 



2646 



3633 



3291 

 3617 

 3630 

 2933 

 2696 

 2907 

 2986 



2335 



124 



177 

 170 



167 

 186 

 139 



112 



83 



59 



50 



48-5 



34-5 



30 



29 



23 



Record of 

 Mean appearance 

 tempera- of J and ? 

 ture flowers 



°C. 



14 



19-3 



17-1 



16-6 

 170 

 19-9 



18-1 



18-8 



17-6 

 16-9 

 191 

 21-5 

 19-8 

 190 

 161 



cJ flowers 

 $ flowers 



14-8 17-5 



* The figures in brackets in column 5 give the percentage increase in dry-weight for 

 the number of days stated in column 2. 



