16 BOTANICAL GAZETTE [sepvhiemee 
less than 6.00%™ in thickness. The average thickness of 93 soil-peas was 
6.55em, 
The weights, air-dry, of the bean-peas and soil-peas were 
Bean-peas Soil-peas 
RT aa re? I. 709%" 20.111" 
NE NE ooo by le eee ore 0.170 0.216 
SS as er 0.227 0.337 
a Se ae Se 0.090 ¢.119 
Comparing these sizes and weights of the seeds with the sizes of the 
plants, we see that the individual seeds are much less reduced in size and 
weight by the enforced semi-parasitism of the parents than are the vege 
tative parts. 
I subsequently soaked these seeds, the ten and the ninety-three, in sepi- 
rate dishes of tap-water, for twenty-four hours. The bean-peas thet 
weighed 3.363, the soil-peas 32.449". The bean-peas, therefore, gained 
1.967 times their weight, the soil-peas 1.613 times. From this it may be 
inferred that the bean-peas either were thinner skinned or contained more 
actively absorbing substances than the soil-peas. Which was the case! 
cannot tell. 
The bean-peas were then placed (2:00 P.M., May 5, 1903) in wet sphag- 
num to root. On May 6, 4:00 P.M., good normal roots 1%™ long had been 
formed by six of these seeds. I mounted them, as before described, 02 
potted plants of Vicia Faba. The following morning three more were st 
on the bean plants. I broke the root of one of the ten seedlings in mountii 
it, and therefore threw it aside. Thus I had, mounted on bean plants, 
nine seedlings of peas grown the previous year on bean plants. These 
seedling peas, therefore, had never been in contact with the soil. Never- 
theless, in the tap-water and especially in the sphagnum there was a cert 
amount of “dirt.” This could be avoided, and will be in future exper 
ments. 
During the succeeding weeks these peas grew into little plants, somewhal 
smaller than those of the preceding season, but well proportioned 
healthy-looking. I moved them from the laboratory to my own : 
where they would be watered during the summer vacation and where © 
could watch them, but unfortunately a dog or some other creature playe 
havoc with my beans one day while I was away from home, and my a 
ment was ended. 
_ Something should be said, even in such a superficial acc 
about the roots of the peas grown on beans, and of the ae 
Toots to the tissues of the beans. There was no tissue union bese 
ccount as this 
of thes 
