﻿43 



255 



ri'siills may l)i' iiscril)e<i lu llu' vaiiabilily ol' Ihe inalerial; ruilheiinurc how dilTerenl 

 doses of ether act upon injured potatoes during the same time oi' exposure; and 

 finally I have sought to investigate whether the influence of ether may be traced 

 after the plants have been withdrawn from the exposure to ether. 



The first 7 experimental-series were carried out during Okt. — Nov. 1907. Large 

 "Hammersmith" potatoes were used, which had been reaped at the end of the 

 summer. The potatoes were kept in a dark cellar exposed to very small changes 

 of temperature and were later experimented with in the same room. Receivers of 

 14 liters' capacity were used for the etherization. As regards the methods of cal- 

 culation cfr. Johannsen : "Elemente der exakten Erblichkeitslehre 1909". Following 

 indications have been used in this paper: the average (the mean) = M. the standard 

 deviation = n. the mean error of the average = m, which is the standard devia- 



a 

 tion <T divided with the square root of the number (n) of individual cases: r?= , 



the probable error being 06745 m. For the calculation of the average and of the 

 standard deviation a division of the results into classes has been as regards series A. 

 For all the other series the averages and the standard deviations have been cal- 

 culated without this classification. 



Series A. (Okt. 1907). 

 The samples, marked a are crushed directly after being split, while those 

 marked h were put aside for 3 days after the injury before crushing. The potatoes 

 were fresh after the exposure. Wounding-cork had been formed. Ternp. = 14°. 



Weight I Number 



of j of 

 potatoes tubers 



!| grs. 



J / a !l 72-09 



\b I 67-94 



., / a \ 73-05 



"lb.. '' 67-85 



3 /■ a ' 70-98 



V b , 70-22 



^ f a 11 64-95 



U) I 64-70 



5 r a ' 63-30 



lb : 66-34 



e f a I 62-62 



\h \ 64-97 



- / a i; 64-07 



H 69-87 



N of 

 amides 



mgrs. 

 23-65 



21-05 

 21-50 

 20-55 

 20-20 

 19-00 

 19-00 

 16-35 

 23-05 

 20-40 

 18-28 

 17-05 

 22-43 

 20-90 



Decrease 

 of N of 

 amides 



5-91 



13-95 



6-82 



»{; 



/a 

 lb 



12 ^ ' 



/a 

 lb 

 /a. 

 lb 



Weight 



of 

 potatoes 



grs. 

 69-40 

 69-11 

 64-96 

 65-33 

 66-15 

 67-81 

 62-58 

 66-48 

 69-52 

 67-75 

 64-86 

 62-36 

 71-99 

 71-82 



Number 



of 

 tubers 



N of 

 amides 



Decrease 

 of Nof 

 amides 



mgrs. 

 16-25 

 14-38 

 18-00 

 17-06 

 17-10 

 14-45 

 12-80 

 12-65 

 12-20 

 11-40 

 15-00 

 13-78 

 13-35 

 12-70 



33- 



"/o 



11-51 

 5-22 



15-50 

 1-17 

 6-56 

 8-13 

 4-87 



